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   O'Hara (Ship)   2 items
   O'Hara Glass Works (Pittsburgh, Pa.)   6 items
   OCLC   6 items
   OCLC -- Directories.   2 items
   OCLC -- Periodicals.   6 items
   OCLC. -- Office of Research -- Periodicals.   2 items
   OCLC. -- Office of Research.   2 items
   OCLC. -- Office of Technical Planning -- Periodicals.   2 items
   OCLC. -- Office of Technical Planning.   2 items
   OCLC. -- Users Council -- Periodicals.   2 items
   OX-5 Club.   2 items
   OX5 Club (Pittsburgh, Pa.)   4 items
   Oak Grove Christian Church Cemetery (Slippery Rock, Pa.)   2 items
   Oakford Park (Jeannette, Pa.)   1 item
   Oakland Centennial Commission.   2 items
   Oakland Library Consortium (Pittsburgh, Pa.). -- Standing Committee on Preservation   2 items
   Oakmont Country Club (Oakmont, Pa.)   2 items
   Oakmont Country Club (Oakmont, Pa.) -- History.   2 items
   Oakmont Country Club (Pa.)   8 items
   Oakmont Country Club.   2 items
   Oakmont Genealogical Study Group.   2 items
   Oakmont Golf Course (Oakmont, Pa.)   2 items
   Oakmont High School (Oakmont, Pa.) -- Students -- Yearbooks.   2 items
   Oakmont Yacht Club (Oakmont, Pa.)   2 items
   Oakwood Park (Crafton, Pa.)   4 items
   Oberammergau Home Arts Exhibition (Chicago, Ill.)   2 items
   Oberlin College. -- Conservatory of Music.   2 items
   Officer Candidate School Number 1 (U.S.) -- Alumni and alumnae.   2 items
   Official Railway Guide Publishing Company.   2 items
   Oglebay Institute, Wheeling.   2 items
   Oglebay Institute.   2 items
   Oglebay Institute. -- Glass Museum   2 items
   Oglebay Institute. -- Mansion Museum.   2 items
   Ohav Shalom Congregation (Donora, Pa.)   2 items
   Ohav Sholom Congregation (Donora, Pa.)   6 items
   Ohave Israel Congregation (Brownsville, Pa.)   2 items
   Oher Chodesh (Pittsburgh, Pa.)   2 items
   Oher Chodrosh Congregation (Pittsburgh, Pa.)   2 items
   Ohio American Revolution Bicentennial Advisory Commission.   12 items
   Ohio Arts Council.   2 items
   Ohio Association of Historical Societies & Museums   2 items
   Ohio College Library Center   2 items
   Ohio College Library Center -- Periodicals.   2 items
   Ohio Company (1747-1779)   4 items
   Ohio Company (1786-1795)   12 items
   Ohio Company (1786-1795) -- Early works to 1800.   2 items
   Ohio Company.   8 items
   Ohio Edison Company.   2 items
   Ohio Finnish-American Historical Society.   2 items
   Ohio Genealogical Society -- History.   2 items
   Ohio Genealogical Society.   2 items
   Ohio Genealogical Society. -- Mahoning County Chapter.   2 items
   Ohio Glass Works (Pittsburgh, Pa.)   2 items
   Ohio Historical Society -- Bibliography.   2 items
   Ohio Historical Society.   26 items
   Ohio Historical Society. -- Local History Office   2 items
   Ohio Historical Society. -- Publications of the Ohio Archaeological and Historical Society.   2 items
   Ohio History Conference -- (2nd : -- 1931 : -- Columbus, Ohio)   2 items
   Ohio Northern University.   2 items
   Ohio River Boulevard (Allegheny County, Pa.)   2 items
   Ohio River Celebration.   2 items
   Ohio River Valley Sanitation Commission.   2 items
   Ohio State Archaeological and Historical Society.   14 items
   Ohio State Archaeological and Historical Society. -- Division of state memorials.   4 items
   Ohio State University -- Bibliography.   2 items
   Ohio State University. -- Press.   2 items
   Ohio Valley Building and Loan Association (Avalon, Pa.)   2 items
   Ohio Valley Folk Research Project.   2 items
   Ohio Valley Folktale Research Project.   4 items
   Ohio Valley Historical Association.   4 items
   Ohio Valley Improvement Association.   2 items
   Ohio Valley Water Company.   2 items
   Ohio Volunteers. -- 125th Regiment.   2 items
   Ohio Wesleyan University.   2 items
   Ohio Yearly Meeting of Friends (Conservative : 1854- )   2 items
   Ohio and Erie Canal.   2 items
   Ohio. -- Constitution.   2 items
   Ohio. -- Dept. of Public Instruction.   2 items
   Ohio. -- National Guard. -- Washington Blues (Steubenville)   2 items
   Ohio. Cincinnati. 1873.   2 items
   Oil Creek Tannery.   2 items
   Oil Region Heritage Park (Pa.)   2 items
   Oil Well Supply Company (Pittsburgh, Pa.)   4 items
   Okehocking Heritage Society.   2 items
   Oklahoma Historical Society   4 items
   Old Bedford Village (Bedford, Pa.)   2 items
   Old Bethpage Village Restoration.   1 item
   Old Blairsville Cemetery (Pa.)   2 items
   Old Buffalo Burying Grounds (Independence, W.Va.)   2 items
   Old Concord Restoration Committee (Concord, Pa.)   2 items
   Old Deer Creek Church (New Bedford, Pa.)   2 items
   Old Donegal Presbyterian Church (Ligonier, Pa.)   4 items
   Old Economy (Ambridge, Pa.)   7 items
   Old Economy Village (Ambridge, Pa.)   2 items
   Old German Cemetery (Middle Lancaster, Pa.)   1 item
   Old German Lutheran Cemetery (Ashland (Township : Clarion County, Pa.))   1 item
   Old Kentucky Home.   2 items
   Old Post Office (Pittsburgh, Pa.)   2 items
   Old Round Church (Pittsburgh, Pa.)   2 items
   Old Salem Church (Derry, Pa.) -- History.   2 items
   Old Salem United Methodist Church (Salem, Pa.) -- History.   2 items
   Old School Baptist Cemetery (Springfield (Township : Huntingdon County, Pa.))   2 items
   Old St. Luke's Church (Scott, Allegheny County, Pa.) -- History.   2 items
   Old St. Patrick's Church (Pittsburgh, Pa.)   2 items
   Old Stone House (Butler County, Pa.)   2 items
   Old Sturbridge Village   4 items
   Old Tennent Church -- History.   2 items
   Old Time Telegraphers' and Historical Association.   2 items
   Old Wye Church (Wye Mills, Md.)   2 items
   Old Zion Lutheran Church.   2 items
   Oldfield Gallery (Pittsburgh, Pa.)   2 items
   Olin Fine Arts Center Gallery (Washington and Jefferson College)   2 items
   Olive Cemetery (Sardis, Pa.)   2 items
   Olive Reformed Church (Westmoreland County, Pa.)   2 items
   Oliver Building (Pittsburgh, Pa.)   2 items
   Oliver Coke and Furnace Co.   2 items
   Oliver High School (Pittsburgh, Pa.)   6 items
   Oliver High School (Pittsburgh, Pa.) -- Reunions.   2 items
   Oliver High School (Pittsburgh, Pa.) -- Students -- Yearbooks.   2 items
   Oliver Iron and Steel Co. (Pittsburgh, Pa.)   4 items
   Oliver Miller Homestead (Pa.)   8 items
   Oliver Miller Homestead Associates (Pa.)   2 items
   Oliver Plaza Dinner Theater (Pittsburgh, Pa.)   2 items
   Oliver Realty.   20 items
   Olympic Games -- (10th : -- 1932 : -- Los Angeles, Calif.)   3 items
   Omicron Delta Kappa.   2 items
   Omohundro Institute of Early American History & Culture.   2 items
   Oneida (Ship)   2 items
   Oneida Community -- Bibliography.   2 items
   Onondaga Historical Association.   6 items
   Ontario Museum Association.   2 items
   Ontario-St. Lawrence Development Commission.   4 items
   Open Doors for the Handicapped (Pittsburgh, Pa.)   2 items
   Open Doors for the Handicapped.   2 items
   Operation Safety Net (Mercy Hospital (Pittsburgh, Pa.))   2 items
   Optimist Club (Pittsburgh, Pa.)   2 items
   Oral History Association.   4 items
   Oral History Association. -- Newsletter.   2 items
   Oral Traditions Project (Union County Historical Society)   6 items
   Oral Traditions Project.   2 items
   Order Italian Sons and Daughters of America   4 items
   Order Sons of Italy in America -- Archives -- Catalogs.   2 items
   Order of Independent Americans.   2 items
   Order of the Crown of Charlemagne.   2 items
   Order of the Eastern Star -- Rituals.   2 items
   Order of the Eastern Star.   2 items
   Order of the Red Cross and Sepulchre.   2 items
   Ore-Ida Foods, Inc. (Boise, Id.)   4 items
   Oregon Historical Society -- Periodicals.   2 items
   Oregon Historical Society.   4 items
   Oregon Historical Society. -- Periodicals.   2 items
   Organization of American Historians -- Periodicals.   2 items
   Organization of American Historians.   10 items
   Organization of American States.   2 items
   Organization of Chinese Americans. -- Anti-Asian Violence Task Force.   2 items
   Organization of Chinese Americans. -- Pittsburgh Chapter.   2 items
   Original Wonder Bakers (Pittsburgh, Pa.)   2 items
   Oriole Motor Coach Lines (Greentree, Pa.) -- Ticket.   2 items
   Ormsby and Doane   2 items
   Orphans Party (Pittsburgh, Pa.)   4 items
   Orphans' Farm School (Zelienople, Pa.)   2 items
   Orthodox Eastern Church   2 items
   Orthodox Eastern Church -- Congresses.   4 items
   Orthodox Eastern Church -- History   2 items
   Orthodox Eastern Church -- Minnesota -- History.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Brownsville.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Carnegie.   10 items
   Orthodox Eastern Church -- Pennsylvania -- Clairton.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Duquesne.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Homestead.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Johnstown.   6 items
   Orthodox Eastern Church -- Pennsylvania -- Midland (Beaver County)   4 items
   Orthodox Eastern Church -- Pennsylvania -- Monessen.   6 items
   Orthodox Eastern Church -- Pennsylvania -- New Salem.   2 items
   Orthodox Eastern Church -- Pennsylvania -- Pittsburgh.   8 items
   Orthodox Eastern Church -- Pennsylvania -- West Brownsville.   6 items
   Orthodox Eastern Church -- Pennsylvania.   2 items
   Orthodox Eastern Church -- Prayer-books and devotions -- English.   2 items
   Orthodox Eastern Church -- United States.   8 items
   Osborne Mission School.   2 items
   Osterling & Co. (Pittsburgh, Pa.)   2 items
   Otis Elevator Company -- Employees.   2 items
   Ottawa County Genealogical Society (Ohio)   2 items
   Ottenheimer Publishers.   2 items
   Otterbein United Methodist Church (Greensburg, Pa.)   2 items
   Otto Dairy (Pittsburgh, Pa.)   2 items
   Otto Krebs Engraving and Steam Lithographic Printing (Pittsburgh, Pa.)   2 items
   Our Lady Help of Christians (Pittsburgh, Pa.) -- Photographs.   4 items
   Our Lady Help of Christians Church (Pittsburgh, Pa.)   4 items
   Our Lady of Angels Parish (Pittsburgh, Pa.)   2 items
   Our Lady of Grace Church (Greensburg, Pa.)   2 items
   Our Lady of Grace Church (Scott, Pa. : Township)   2 items
   Our Lady of Joy Church (Holiday Park, Pa.)   2 items
   Our Lady of Mercy Academy (Pittsburgh, Pa.) -- Students -- Yearbooks.   2 items
   Our Lady of Mt. Carmel Roman Catholic Church (Ehrenfeld, Pa.)   2 items
   Our Lady of Pompei (Parish : New York, N.Y.) -- History.   2 items
   Our Lady of Victory Church (Harwick, Pa.)   2 items
   Our Lady of the Miraculous Medal Church (Meadow Lands, Pa.)   2 items
   Our Savior Lutheran Church (Mt. Lebanon, Pa.)   2 items
   Outlook Club (Beaver Falls, Pa.)   2 items
   Overbeck Pottery.   2 items
   Overbrook School for the Blind (Philadelphia, Pa.)   2 items
   Overture (Periodical)   2 items
   Owl Cab Co. (Pittsburgh, Pa.) -- Pictorial works.   2 items
   Owls Literary Society (Pittsburgh, Pa.) -- Minute book.   2 items

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