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Railroad Strike, U.S., 1877., Riots -- Pennsylvania -- Pittsburgh., Strikes and lockouts -- Railroads -- Pennsylvania -- Pittsburgh.
Greater Pittsburgh Chamber of Commerce -- History., Boards of trade -- Pennsylvania -- Pittsburgh -- History.: Pittsburgh (Pa.) -- Commerce -- History.
145 p. : ill. ; 23 cm.
Iron industry and trade -- Pennsylvania -- History -- 18th century.
227 pages : illustrations 23 cm.
World's Columbian Exposition (1893 : Chicago, Ill.) -- Catalogs., Industries -- Pennsylvania -- Exhibitions., Pennsylvania -- Exhibitions.
218 pages : illustrations, map 24 cm.
Pennsylvania Railroad -- History., Pennsylvania Railroad -- Statistics., Pennsylvania -- History., Railroads -- Pennsylvania -- History., Railroads -- New Jersey -- History., Pennsylvania -- Description and travel., New Jersey -- Description and travel.
Pittsburgh (Pa.) -- Description and travel.
xxvi, 416 pages : illustrations, maps 24 cm.
Pittsburgh (Pa.) -- Social conditions -- 20th century., Civic improvement -- Pennsylvania -- Pittsburgh., Sanitation -- Pennsylvania -- Pittsburgh., Housing -- Pennsylvania -- Pittsburgh., Working class -- Dwellings -- Pennsylvania -- Pittsburgh., Working class -- Pennsylvania -- Pittsburgh -- Social conditions -- 20th century.
xviii, 554 pages : illustrations, maps 24 cm.
Industries -- Pennsylvania -- Pittsburgh -- Periodicals., Pittsburgh (Pa.) -- Commerce -- Periodicals.
4 v. : ill. ; 28 cm.;"Monthly";"Began with New series, v. 1 (1906); ceased with v. 4, no. 4 (Apr. 1908)."
Coal Strike, Somerset County, Pa., 1922-1923., Strikes and lockouts -- Coal mining -- Pennsylvania.
ix, 259 pages, 1 unnumbered folded leaf : map 21 cm.
Manufacturing industries -- Pennsylvania -- Pittsburgh., Industries -- Pennsylvania -- Pittsburgh., Industries -- Pennsylvania -- Pittsburgh -- Directories., Pittsburgh (Pa.) -- Commerce., Pittsburgh (Pa.) -- Description and travel., Pittsburgh (Pa.) -- History.
38-255 pages : illustrations 20 x 26 cm.
Iron -- Metallurgy., Steel -- Metallurgy., Iron industry and trade.
Iron and steel workers -- Pennsylvania -- Pittsburgh., Labor -- Pennsylvania -- Pittsburgh., Labor movement -- Pennsylvania -- Pittsburgh.
xiii, 380 pages : illustrations, map 24 cm.
Pittsburgh (Pa.) -- Economic conditions., Pittsburgh (Pa.) -- Commerce., Industries -- Pennsylvania -- Pittsburgh.
126 pages : illustrations, map 23 cm.
United States Steel Corporation -- Corrupt practices., Tennessee Coal and Iron Company -- Corrupt practices.: Steel industry and trade -- Corrupt practices -- United States.: Antitrust investigations -- United States.
8 v. ; 23 cm.
Iron industry and trade -- United States -- Congresses., Steel industry and trade -- United States -- Congresses.
22 pages 23 cm.
Iron-works -- United States., Steel-works -- United States., Iron industry and trade -- United States., Iron industry and trade -- Handbooks, manuals, etc., Steel industry and trade -- United States., Steel industry and trade -- Handbooks, manuals, etc., Machinery -- Directories.
xxviii, 554 pages : illustrations 26 cm.
Erie Railroad Company -- History., Railroads -- United States -- History.