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The collection is arranged into the following 29 series:

Series I. Abraham Overholt & Company, 1881-1888

Series II. Carnegie Brothers & Company, Ltd., 1867-1894

Series III. Carnegie Company, 1900-1901

Series IV. Carnegie Steel Company, Ltd., 1892-1900

Series V. Carnegie, Phipps, & Company, Ltd., 1887 to 1893

Series VI. Cerro de Pasco Companies, 1901-1925

Series VII. Clairton Brick & Manufacturing Company, 1901-1904

Series VIII. Clairton Street Railway Company, 1905-1916

Series IX. Correspondence, 1883-1919

Series X. Ephemeral Material, 1878-1947

Series XI. Faraday Coal & Coke Company, 1862-1934

Series XII. Frick Building, 1897-1983

Series XIII. Henry Clay Frick Coke Companies, 1871-1900

Series XIV. Highland Building, 1909-1922

Series XV. Hump Removal, 1899-1914

Series XVI. Jellico Coal Lands, 1903-1943

Series XVII. Josiah Vankirk Thompson, 1914-1920

Series XVIII. Shaw Coal Company, 1890-1925

Series XIX. St. Clair Improvements Company, 1901-1915

Series XX. St. Paul Coal Company, 1914-1926

Series XXI. Union Arcade Building/Union Trust Building, 1906-1948

Series XXII. Union Trust Company, 1895-1921

Series XXIII. Union, Joliet, and Illinois Steel Companies, 1884-1902

Series XXIV. United States Steel Corporation, 1899-1919

Series XXV. Westmoreland- Fayette Historical Society, 1906-1987

Series XXVI. William Penn Hotel, 1890-1925

Series XXVII. Pittsburgh Atlases and Plat Maps

Series XXVIII. Maps and Architectural Drawings

Series XXIX. Printed Materials