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Date

Subject

• Rivers (250) + -
• Pennsylvania (222) + -
• Locks (Hydraulic engineering) (136) + -
• Dams (117) + -
• Monongahela River (W. Va. and Pa.) (104) + -
• Pittsburgh. (98) + -
• Labor (86) + -
• Blue collar workers (84) + -
• Ohio River. (80) + -
• Construction projects (73) + -

• Allegheny River (Pa. and N.Y.) (56) + -
• Bridges (48) + -
• Riverboats (43) + -
• West Virginia (42) + -
• Factories (35) + -
• Barges (25) + -
• Civil functions. (21) + -
• Cofferdams (21) + -
• Midland. (21) + -
• United States. Army. Corps of Engineers (18) + -
• Monongahela (W. Va. and Pa.) (16) + -
• Pennsylvania. (16) + -
• New Cumberland. (14) + -
• Railroad trains (13) + -
• Charleroi. (12) + -
• Steamboats (12) + -
• Bluff (Pittsburgh, Pa.) (11) + -
• Floods (11) + -
• Railroads (11) + -
• Midland (Pa.) (10) + -
• North Shore (Pittsburgh, Pa.) (10) + -
• East Steubenville. (9) + -
• Charleroi (Pa.) (8) + -
• Downtown (Pittsburgh, Pa.) (8) + -
• Elizabeth. (8) + -
• South Side (Pittsburgh, Pa.) (8) + -
• Elizabeth (Pa.) (7) + -
• H. J. Heinz Company. (7) + -
• Ice (7) + -
• Point Marion. (7) + -
• Railroad bridges (7) + -
• Barges. (6) + -
• Braddock. (6) + -
• Brownsville. (6) + -
• Coal (6) + -
• Construction projects. (6) + -
• Dams. (6) + -
• Emsworth. (6) + -
• Morgantown. (6) + -
• Riverboats. (6) + -