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   PERFORMING ARTS COLLECTION   88 items
   PETROLEUM COLLECTION   77 items
   PILGRIM COLLECTION   4 items
   PITTSBURGH AUTHOR   2 items
   PITTSBURGH PUBLICATION   4 items
   PITTSBURGH PUBLICATIONS   3 items
   POLISH AMERICAN COLLECTION   166 items
   PPG Place (Pittsburgh, Pa.)   2 items
   Pacific Coast Indians, Wars with, 1847-1865   2 items
   Pacific railroads -- History.   2 items
   Packets   8 items
   Packets -- Mississippi River Region -- Registers.   2 items
   Packets -- United States -- Directories.   2 items
   Paddle steamers -- Ohio River -- History.   2 items
   Paddle steamers.   1 item
   Pageants   2 items
   Pageants -- Czechoslovakia.   2 items
   Pageants -- Massachusetts -- Plymouth.   2 items
   Pageants -- Pennsylvania -- Lancaster.   2 items
   Pageants -- Pennsylvania -- Pittsburgh.   2 items
   Pageants -- West Virginia -- Point Pleasant.   2 items
   Paint   5 items
   Paint -- Catalogs.   4 items
   Paint industry and trade -- Pennsylania -- Oakmont.   2 items
   Paint industry and trade -- Pennsylvania -- Pittsburgh.   2 items
   Paint industry and trade.   2 items
   Paint indutry and trade -- Pennsylvania -- Pittsburgh.   2 items
   Paint shops -- Equipment and supplies.   2 items
   Painted country furniture, Pennsylvania Dutch   2 items
   Painters   4 items
   Painters -- Netherlands -- Fiction.   2 items
   Painters -- Pennsylvania -- Biography.   4 items
   Painters -- Pennsylvania -- Pittsburgh.   4 items
   Painters -- Pennsylvania -- Pittsburgh. -- Biography.   1 item
   Painters -- Pennsylvania.   6 items
   Painters -- United States   2 items
   Painters -- United States -- Biography.   14 items
   Painters -- United States -- Dictionaries.   2 items
   Painting   2 items
   Painting -- Bibliography -- Periodicals.   2 items
   Painting -- Conservation and restoration   2 items
   Painting -- Exhibitions -- Periodicals.   4 items
   Painting -- Exhibitions.   10 items
   Painting -- Illinois -- Chicago -- Exhibitions.   2 items
   Painting -- Pennsylvania -- Latrobe -- Exhibitions.   2 items
   Painting -- Pennsylvania -- Philadelphia -- Catalogs.   4 items
   Painting -- Pennsylvania -- Pittsburgh -- Catalogs.   2 items
   Painting -- Pennsylvania -- Pittsburgh.   2 items
   Painting -- Private collections   4 items
   Painting -- Private collections -- Pennsylvania -- Pittsburgh -- Exhibitions.   4 items
   Painting -- Reproduction   2 items
   Painting -- Reproductions -- Periodicals.   2 items
   Painting -- Technique   2 items
   Painting -- United States -- History.   2 items
   Painting -- United States.   2 items
   Painting -- Washington (D.C.) -- Catalogs.   2 items
   Painting, American   8 items
   Painting, American -- Bibliography.   2 items
   Painting, American -- Exhibitions.   10 items
   Painting, American -- Pennsylvania -- Pittsburgh -- Exhibitions.   2 items
   Painting, American -- Pennsylvania -- Pittsburgh.   3 items
   Painting, American -- Pennsylvania -- Scalp Level -- 19th century -- Exhibitions.   2 items
   Painting, American -- Pennsylvania -- Scalp Level -- 20th century -- Exhibitions.   2 items
   Painting, American -- Pennsylvania.   2 items
   Painting, English -- Exhibitions.   2 items
   Painting, French -- Exhibitions.   2 items
   Painting, Industrial   2 items
   Painting, Modern -- 19th century -- France -- Exhibitions.   2 items
   Painting, Modern -- 19th century -- Juvenile literature.   2 items
   Painting, Modern -- 19th century -- Pennsylvania -- Pittsburgh -- Exhibitions.   2 items
   Painting, Modern -- 20th century -- Exhibitions.   2 items
   Painting, Modern -- 20th century -- Pennsylvania -- Pittsburgh -- Exhibitions.   4 items
   Painting, Modern -- 20th century -- United States -- Exhibitions.   2 items
   Painting, Modern -- Pennsylvania -- Pittsburgh.   2 items
   Palatine Americans -- Genealogy -- Periodicals.   2 items
   Palatines   4 items
   Paleo-Indians.   1 item
   Paleography, American   2 items
   Paleography, German   2 items
   Paleontology   2 items
   Paleontology -- Kansas.   2 items
   Paleontology -- Pennsylvania.   6 items
   Paleontology -- United States -- History -- 20th century.   2 items
   Paleontology -- West Virginia -- Boone County.   2 items
   Paleontology -- West Virginia -- Logan County.   2 items
   Paleontology -- West Virginia -- Mingo County.   2 items
   Paleontology -- West Virginia -- Preston County.   2 items
   Paleontology -- West Virginia.   4 items
   Palestinian Arabs -- Jerusalem -- Psychology.   2 items
   Palestinian Arabs.   2 items
   Pan-Africanism -- History.   2 items
   Panther Hollow Research Park (Proposed)   2 items
   Paper -- Catalogs.   2 items
   Paper -- Defects.   2 items
   Paper -- Directories.   2 items
   Paper -- Preservation   3 items
   Paper -- Preservation -- Handbooks, manuals, etc.   4 items
   Paper -- Preservation -- Periodicals.   2 items
   Paper -- Testing   2 items
   Paper -- handbooks   2 items
   Paper industry -- Directories.   2 items
   Paper industry -- Pennsylvania -- Pittsburgh.   2 items
   Paper industry -- Periodicals.   2 items
   Paper industry -- United States -- Directories.   2 items
   Paper money   4 items
   Paper money -- Pennsylvania.   2 items
   Paper money -- United States   2 items
   Paperbacks -- Bibliography.   2 items
   Papermaking   2 items
   Papermaking -- Chemistry -- Periodicals.   2 items
   Papermaking -- Pennsylvania -- History.   2 items
   Paperweights   4 items
   Paperweights -- Collectors and collecting -- United States -- Periodicals.   2 items
   Paperweights -- Collectors and collecting.   2 items
   Paperweights -- United States.   4 items
   Paperweights, American.   2 items
   Parades -- Pennsylvania -- Beaver -- Photographs.   2 items
   Parades -- Pennsylvania -- Pittsburgh -- East Liberty.   4 items
   Parades -- Pennsylvania -- Pittsburgh.   4 items
   Parades -- Pennsyvlania -- Pittsburgh.   1 item
   Parent and child -- Longitudinal studies.   2 items
   Parenting   2 items
   Parents' and teachers' associations -- Pennsylvania -- Pittsburgh.   6 items
   Parishes -- New York Metropolitan Area.   2 items
   Parishes -- United States -- Directories.   2 items
   Parishes -- United States -- Historiography.   2 items
   Parks   2 items
   Parks -- Pennsylvania   8 items
   Parks -- Pennsylvania -- Allegheny County -- Planning.   4 items
   Parks -- Pennsylvania -- Allegheny County.   6 items
   Parks -- Pennsylvania -- Allegheny.   4 items
   Parks -- Pennsylvania -- Fox Chapel.   1 item
   Parks -- Pennsylvania -- History.   2 items
   Parks -- Pennsylvania -- Indiana Township.   2 items
   Parks -- Pennsylvania -- Management -- History.   2 items
   Parks -- Pennsylvania -- O'Hara (Township : Allegheny County).   1 item
   Parks -- Pennsylvania -- Pittsburgh -- Periodicals.   2 items
   Parks -- Pennsylvania -- Pittsburgh Region -- Planning.   4 items
   Parks -- Pennsylvania -- Pittsburgh.   38 items
   Parkway East.   4 items
   Parkway North.   2 items
   Parkway.   2 items
   Parliamentary practice   16 items
   Parliamentary practice -- United States.   2 items
   Part-songs, Sacred   2 items
   Partnership -- Great Britain.   2 items
   Partnership -- United States.   2 items
   Party committees -- Pennsylvania.   2 items
   Party decorations.   2 items
   Passenger pigeon   2 items
   Passenger ships -- Pennsylvania -- Conneaut Lake.   1 item
   Passover   4 items
   Passports   4 items
   Past - Philosophical perspectives   2 items
   Pastoral psychology   2 items
   Pastoral theology.   2 items
   Pastries.   2 items
   Pastry.   4 items
   Patent extensions -- United States.   2 items
   Patent medicines   5 items
   Patent medicines -- Pennsylvania -- Pittsburgh.   2 items
   Patentees -- Pennsylvania -- Allegheny.   2 items
   Patentees -- Pennsylvania -- Pittsburgh.   2 items
   Patents   4 items
   Patents -- Pennsylvania -- Washington County.   2 items
   Patents -- Pennsylvania -- Pittsburgh.   8 items
   Patents -- United States   2 items
   Patents -- United States -- Pennsylvania.   2 items
   Patents -- United States -- Periodicals.   1 item
   Pathology.   1 item
   Patriotic music.   2 items
   Patriotic poetry, American   2 items
   Patriotic societies -- Directories.   2 items
   Patriotic societies -- Pennsylvania -- Pittsburgh.   4 items
   Patriotic societies -- United States -- Periodicals.   2 items
   Patriotic societies -- United States.   4 items
   Patriotism   1 item
   Patriotism -- United States -- Periodicals.   2 items
   Patronage, Political   2 items
   Patronage, Political -- Pennsylvania.   2 items
   Pattern glass -- Pennsylvania -- Tarentum.   2 items
   Pattern glass -- Reproduction   2 items
   Pattern glass -- United States -- History -- 19th century -- Catalogs.   2 items
   Pattern glass -- United States -- History -- 19th century -- Collectors and collecting -- Catalogs.   2 items
   Pattern glass -- United States -- History -- 19th century.   2 items
   Pattern glass -- United States -- History -- 20th century -- Collectors and collecting -- Catalogs.   2 items
   Pattern glass -- United States -- History -- 20th century.   2 items
   Pattern glass -- United States -- Periodicals.   2 items
   Pattern glass -- United states -- History -- 20th century -- Catalogs.   2 items
   Pattern glass, Victorian   2 items
   Patton Township (Pa.)   2 items
   Pawnbroking -- Pennsylvania -- Pittsburgh.   2 items
   Paxton Boys   2 items
   Peace   2 items
   Peace -- Congresses.   4 items
   Peace -- Periodicals.   2 items
   Peace -- Societies, etc. -- Periodicals.   2 items
   Peace movements -- Pennsylvania -- Allegheny County.   2 items
   Pearl Harbor, Attack on, 1941.   2 items
   Pearson Zoaves.   2 items
   Penguins -- Fiction.   2 items
   Penicillin -- History.   2 items
   Peninsular Campaign, 1862   8 items
   Penmanship, American   2 items
   Penmanship.   1 item
   Penn (Westmoreland County, Pa. : Township) -- Churches.   2 items
   Penn Avenue (Pittsburgh, Pa.)   2 items
   Penn Foundry (Pittsburgh, Pa.)   2 items
   Penn Hills (Pa.) -- Cemeteries.   2 items
   Penn Township (Pa.) -- Advertising material, 1963.   2 items
   Penn Township (Pa.) -- History.   4 items
   Penn land grant.   2 items
   Penn-Craft (Pa.) -- History.   2 items
   Penn-Lincoln Parkway.   2 items
   Pennsylvania -- Aeronautical engineering industries, to 1980   2 items
   Pennsylvania -- Cities and towns.   2 items
   Pennsylvania -- Colleges.   2 items
   Pennsylvania -- Comic books, strips, etc.   2 items
   Pennsylvania -- Cookbooks.   2 items
   Pennsylvania -- Counties -- Names, Geographical.   2 items
   Pennsylvania -- Description and travel -- Periodicals.   2 items
   Pennsylvania -- East Central European settlers -- Social life, 1900-1945   2 items
   Pennsylvania -- History -- Colonial period, ca. 1600-1775.   2 items
   Pennsylvania -- Industries.   2 items
   Pennsylvania -- Industry.   2 items
   Pennsylvania -- Land use.   2 items
   Pennsylvania -- Law schools.   2 items
   Pennsylvania -- Pittsburgh -- Sculptures - Illustrations   2 items
   Pennsylvania -- Pittsburgh -- Social life, 1890-1910 - Personal observations   2 items
   Pennsylvania -- Political events, c.1755-1775 -- Franklin, Benjamin   2 items
   Pennsylvania -- Political events, c.1755-1775 -- Galloway, Joseph   2 items
   Pennsylvania -- Senators.   2 items
   Pennsylvania -- Social life, 1865-1918   2 items
   Pennsylvania -- World War, 1914-1918.   2 items
   Pennsylvania Canal.   4 items
   Pennsylvania Coalition against Pornography.   2 items
   Pennsylvania Dutch   22 items
   Pennsylvania Dutch -- Cultural assimilation.   1 item
   Pennsylvania Dutch -- Epigrams.   2 items
   Pennsylvania Dutch -- Ethnic identity.   1 item
   Pennsylvania Dutch -- Genealogy.   2 items
   Pennsylvania Dutch -- History   4 items
   Pennsylvania Dutch -- Ohio -- Boardman -- Genealogy.   2 items
   Pennsylvania Dutch -- Pennsylvania   2 items
   Pennsylvania Dutch -- Pennsylvania -- Waynesboro Region -- History.   2 items
   Pennsylvania Dutch -- Periodicals.   2 items
   Pennsylvania Dutch -- Quotations.   2 items
   Pennsylvania Dutch -- Religion -- History -- 19th century.   1 item
   Pennsylvania Dutch -- Social life and customs.   4 items
   Pennsylvania Gas Company (Pittsburgh, Pa.)   2 items
   Pennsylvania German dialect   6 items
   Pennsylvania German dialect -- Dictionaries -- English.   2 items
   Pennsylvania German dialect -- Dictionaries.   2 items
   Pennsylvania Infantry -- 11th Regiment, 1778-1781.   2 items
   Pennsylvania Railroad Strike.   1 item
   Pennsylvania Railroad.   5 items
   Pennsylvania Route 28.   2 items
   Pennsylvania Turnpike (Pa.)   2 items
   Pennsylvania in art -- Exhibitions.   2 items
   Pennsylvania infantry. 1st battalion (6 months vols.) 1863-1864.   2 items
   Pennsylvania, 1915   2 items
   Pennsylvanian customs, to 1981   2 items
   Pension trusts -- Pennsylvania -- Pittsburgh.   2 items
   Pensions, Military -- United States -- Revolution, 1775-1783.   2 items
   Pentecost Festival -- Czechoslovakia.   2 items
   Pentecostal churches -- Italian.   4 items
   Peoples Natural Gas Company (Pittsburgh, Pa.)   2 items
   Pequot Indians   2 items
   Pequot War, 1636-1638   2 items
   Percheron horse.   2 items
   Perfection -- Periodicals.   2 items
   Performing arts -- Pennsylvania -- Pittsburgh -- Periodicals.   6 items
   Performing arts -- Pennsylvania -- Pittsburgh.   6 items
   Performing arts -- Pennsylvania -- Washington County.   2 items
   Performing arts -- Pennsylvania.   2 items
   Performing arts sponsorship -- Handbooks, manuals, etc.   2 items
   Perfume -- Pennsylvania -- Pittsburgh.   2 items
   Perfume bottles -- Czechoslovakia -- History -- 20th century -- Catalogs.   2 items
   Periodicals   6 items
   Periodicals -- Bibliography   2 items
   Periodicals -- Bibliography -- Union lists   10 items
   Periodicals -- Canada -- bibliography.   2 items
   Periodicals -- Directories.   2 items
   Periodicals -- Prices -- Periodicals.   2 items
   Periodicals -- United States -- bibliography.   2 items
   Periodicals in microform -- Periodicals.   2 items
   Perkins family (Edward Perkins, b. ca. 1625)   2 items
   Permanent paper -- Periodicals.   2 items
   Permanent paper -- United States.   2 items
   Perrysville (Pa.) -- Churches.   2 items
   Persecution -- History -- Early works to 1800.   2 items
   Persian Gulf War, 1991 -- Communications.   2 items
   Persian Gulf War, 1991.   2 items
   Personality development   2 items
   Personality disorders.   2 items
   Personnel management   2 items
   Personnel management -- Pennsylvania -- Pittsburgh.   4 items
   Personnel management -- Periodicals.   2 items
   Pesticides -- Environmental aspects   2 items
   Pesticides -- Law and legislation -- Pennsylvania.   2 items
   Pesticides -- Toxicology   2 items
   Pesticides and wildlife   2 items
   Pests -- Control   4 items
   Pests -- Integrated control   2 items
   Pet food industry -- United States.   2 items
   Peters (Washington County,Pa : Township) -- History.   2 items
   Peters Creek (Pa.) -- History.   2 items
   Peters Township (Pa.) -- History.   2 items
   Petersburg Crater, Battle of, Va., 1864   6 items
   Petroglyphs   2 items
   Petroleum   12 items
   Petroleum -- History.   6 items
   Petroleum -- North America -- History.   2 items
   Petroleum -- Ontario.   2 items
   Petroleum -- Pennsylvania -- Fiction.   2 items
   Petroleum -- Pennsylvania -- History -- Pictorial works.   2 items
   Petroleum -- Pennsylvania -- Maps.   2 items
   Petroleum -- Pennsylvania -- Venango County -- Maps.   4 items
   Petroleum -- Pennsylvania -- Venango County.   10 items
   Petroleum -- Pennsylvania.   24 items
   Petroleum -- Texas.   2 items
   Petroleum -- United States   10 items
   Petroleum -- United States -- History.   2 items
   Petroleum industry and trade   9 items
   Petroleum industry and trade -- Bibliography.   2 items
   Petroleum industry and trade -- California -- History.   2 items
   Petroleum industry and trade -- History.   6 items
   Petroleum industry and trade -- Labor productivity.   2 items
   Petroleum industry and trade -- Military aspects -- History -- 20th century.   2 items
   Petroleum industry and trade -- New Jersey.   2 items
   Petroleum industry and trade -- New York (State) -- Pictorial works   2 items
   Petroleum industry and trade -- Pennsylvania -- Allegheny County.   2 items
   Petroleum industry and trade -- Pennsylvania -- Brady (Butler County : Township)   2 items
   Petroleum industry and trade -- Pennsylvania -- Corrupt practices -- History -- 19th century.   2 items
   Petroleum industry and trade -- Pennsylvania -- History -- 19th century.   4 items
   Petroleum industry and trade -- Pennsylvania -- History.   14 items
   Petroleum industry and trade -- Pennsylvania -- Oil City.   2 items
   Petroleum industry and trade -- Pennsylvania -- Oil Creek.   2 items
   Petroleum industry and trade -- Pennsylvania -- Pictorial works.   4 items
   Petroleum industry and trade -- Pennsylvania -- Pithole.   2 items
   Petroleum industry and trade -- Pennsylvania -- Pittsburgh.   10 items
   Petroleum industry and trade -- Pennsylvania -- Titusville.   3 items
   Petroleum industry and trade -- Pennsylvania -- Warren County -- History.   2 items
   Petroleum industry and trade -- Pennsylvania -- Warren County.   2 items
   Petroleum industry and trade -- Pennsylvania.   17 items
   Petroleum industry and trade -- Periodicals.   2 items
   Petroleum industry and trade -- Persian Gulf States.   2 items
   Petroleum industry and trade -- Political aspects -- History -- 20th century.   2 items
   Petroleum industry and trade -- United States   22 items
   Petroleum industry and trade -- United States -- Folklore.   2 items
   Petroleum industry and trade -- United States -- History.   2 items
   Petroleum industry and trade -- United States -- Periodicals.   6 items
   Petroleum industry and trade -- United States -- Songs and music.   2 items
   Petroleum pipelines   2 items
   Petroleum refining -- Pennsylvania -- Pittsburgh.   4 items
   Petrology -- Pennsylvania.   2 items
   Pewter   2 items
   Pewter -- Collectors and collecting   2 items
   Pewter -- United States -- Directories.   2 items
   Pewter -- United States -- History.   2 items
   Pewter -- United States.   2 items
   Pharmaceutical chemistry.   2 items
   Pharmaceutical industry   2 items
   Pharmaceutical industry -- United States -- Periodicals.   2 items
   Pharmaceutical industry -- United States.   2 items
   Pharmacists -- Pennsylvania.   2 items
   Pharmacists -- Societies, etc.   1 item
   Pharmacy -- Early works to 1800.   2 items
   Pharmacy -- Virginia -- Williamsburg.   2 items
   Pharmacy colleges -- Pennsylvania -- Pittsburgh.   4 items
   Philadelphia (Pa.) -- Clubs.   2 items
   Philadelphia (Pa.) -- Orphanages.   2 items
   Philadelphia Campaign, 1777-1778   2 items
   Philadelphia Company (Pittsburgh, Pa.)   4 items
   Philanthropists -- Pennsylvania -- Biography.   2 items
   Philanthropists -- Pennsylvania -- Pittsburgh.   12 items
   Philanthropists -- United States -- Biography.   12 items
   Philanthropy -- Pennsylvania -- Pittsburgh.   2 items
   Philately   4 items
   Philosophers.   2 items
   Philosophy   2 items
   Philosophy -- History.   2 items
   Philosophy -- Pictorial works.   2 items
   Philosophy -- Research grants -- Periodicals.   2 items
   Philosophy -- Societies, etc.   2 items
   Philosophy -- Societies, etc. -- Pennsylvania -- Pittsburgh.   2 items
   Phoenix Brewery   2 items
   Photograhs, Stereoscopic -- Pennsylvania -- Tarentum.   2 items
   Photograph albums -- Pennsylvania -- Pittsburgh.   4 items
   Photograph collections -- Delaware -- Wilmington -- Catalogs.   2 items
   Photograph collections -- Management -- Handbooks, manuals, etc.   2 items
   Photograph collections -- Pennsylvania -- Catalogs.   2 items
   Photograph collections -- United States -- Directories.   2 items
   Photograph collections -- Washington (D.C.) -- Catalogs.   2 items
   Photograph collections -- Washington Metropolitan Area -- Directories.   2 items
   Photographers -- Montana -- Biography.   2 items
   Photographers -- Ohio -- Dayton.   2 items
   Photographers -- Pennsylvania -- Biography.   4 items
   Photographers -- Pennsylvania -- Directories.   2 items
   Photographers -- Pennsylvania -- Periodicals.   2 items
   Photographers -- Pennsylvania -- Pittsburgh -- History -- 19th century -- Exhibitions.   4 items
   Photographers -- Pennsylvania -- Pittsburgh -- History -- 20th century -- Exhibitions.   4 items
   Photographers -- Pennsylvania -- Pittsburgh.   6 items
   Photographers -- Pennsylvania -- Pittsburgh. -- Biography.   3 items
   Photographers -- United States   2 items
   Photographers -- United States -- Biography.   2 items
   Photographers -- West Virginia -- Biography.   2 items
   Photographic industry -- United States.   2 items
   Photographs   5 items
   Photographs -- Catalogs.   4 items
   Photographs -- Collections.   1 item
   Photographs -- Collectors and collecting.   4 items
   Photographs -- Conservation   2 items
   Photographs -- Conservation and restoration   14 items
   Photographs -- Conservation and restoration -- Congresses.   2 items
   Photographs -- Conservation and restoration -- Handbooks, manuals, etc.   2 items
   Photographs -- Trimming, mounting, etc.   2 items
   Photographs, Stereoscopic -- Pennsylvania -- Pittsburgh.   2 items
   Photography   7 items
   Photography -- Business methods.   4 items
   Photography -- Equipment and supplies   2 items
   Photography -- Equipment and supplies -- Catalogs.   2 items
   Photography -- Exhibitions -- Pennsylvania -- Pittsburgh.   2 items
   Photography -- Handbooks, manuals, etc.   10 items
   Photography -- History -- Pennsylvania -- Pittsburgh.   1 item
   Photography -- History.   6 items
   Photography -- Marketing.   3 items
   Photography -- Negatives -- Catalogs.   2 items
   Photography -- Pennsylvania -- Pittsburgh -- History -- 19th century -- Exhibitions.   4 items
   Photography -- Pennsylvania -- Pittsburgh -- History -- 20th century -- Exhibitions.   4 items
   Photography -- Pennsylvania -- Pittsburgh.   14 items
   Photography -- Pennsylvania -- Sewickley.   2 items
   Photography -- Periodicals   2 items
   Photography -- Printing processes.   1 item