| Most Recent Entries |
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| 2 | Others | PA, |
| 1 | Others | PA, , Anti-Saloon League |
| 1 | Others | PA, , Bell Telephone Co |
| 1 | Others | PA, , US Coast and Geodetic Survey |
| 1 | Others | PA, , US Department of Labor |
| 3 | Others | PA, , US Geological Survey |
| 2 | Others | PA, , YMCA |
| 1 | Others | PA, Allegheny Co, Allegheny, Riter-Conley Manufacturing Co |
| 2 | Others | PA, Allegheny Co, Clairton |
| 2 | Others | PA, Allegheny Co, Clairton, Carnegie Steel Co |
| 1 | Others | PA, Allegheny Co, Coraopolis, Dravo Contracting Co |
| 4 | Others | PA, Allegheny Co, Duquesne, Carnegie Steel Co |
| 1 | Others | PA, Allegheny Co, East Liberty, YMCA |
| 29 | Others | PA, Allegheny Co, East Pittsburgh, Westinghouse Electric and Manufacturing Co |
| 1 | Others | PA, Allegheny Co, Homestead, Carnegie Steel Co |
| 2 | Others | PA, Allegheny Co, Leetsdale, Riter-Conley Manufacturing Co |
| 1 | Others | PA, Allegheny Co, McKeesport, Carnegie Steel Co |
| 1 | Others | PA, Allegheny Co, McKeesport, National Tube Co |
| 7 | Others | PA, Allegheny Co, Munhall, Carnegie Steel Co |
| 3 | Others | PA, Allegheny Co, Munhall, Homestead Steel Works |
| 5 | Others | PA, Allegheny Co, Pittsburgh |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Aluminum Co of America |
| 2 | Others | PA, Allegheny Co, Pittsburgh, American Bridge Co |
| 5 | Others | PA, Allegheny Co, Pittsburgh, American Sheet and Tin Plate Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, American Steel and Wire Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Anti-Saloon League |
| 2 | Others | PA, Allegheny Co, Pittsburgh, Armstrong Cork and Insulation Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Babcock and Wilcox Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Bell Telephone Co |
| 2 | Others | PA, Allegheny Co, Pittsburgh, Bethlehem Steel Co |
| 6 | Others | PA, Allegheny Co, Pittsburgh, Carnegie Institute of Technology |
| 8 | Others | PA, Allegheny Co, Pittsburgh, Carnegie Steel Co |
| 6 | Others | PA, Allegheny Co, Pittsburgh, Dravo Contracting Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Equitable Life Assurance Society |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Fort Pitt Bridge Works |
| 3 | Others | PA, Allegheny Co, Pittsburgh, General Electric |
| 2 | Others | PA, Allegheny Co, Pittsburgh, H. Koppers Co |
| 6 | Others | PA, Allegheny Co, Pittsburgh, Jones and Laughlin Steel Co |
| 5 | Others | PA, Allegheny Co, Pittsburgh, McClintic-Marshall Construction Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, National Tube Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Packard Motor Car Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pennsylvania State Highway Department |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pullman Palace Car Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Riter-Conley Manufacturing Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Standard Underground Cable Co |
| 9 | Others | PA, Allegheny Co, Pittsburgh, US Department of Interior |
| 1 | Others | PA, Allegheny Co, Pittsburgh, US Pension Bureau |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Westinghouse Air Brake Co |
| 48 | Others | PA, Allegheny Co, Pittsburgh, Westinghouse Electric and Manufacturing Co |
| 1 | Others | PA, Allegheny Co, Rankin, McClintic-Marshall Construction Co |
| 1 | Others | PA, Allegheny Co, Rankin, Westinghouse Electric and Manufacturing Co |
| 1 | Others | PA, Allegheny Co, Swissvale, Carnegie Steel Co |
| 2 | Others | PA, Allegheny Co, Swissvale, Westinghouse Electric and Manufacturing Co |
| 2 | Others | PA, Allegheny Co, Wilkinsburg, Westinghouse Air Brake Co |
| 39 | Others | PA, Allegheny Co, Wilkinsburg, Westinghouse Electric and Manufacturing Co |
| 5 | Others | PA, Allegheny Co, Wilmerding, Westinghouse Air Brake Co |
| 7 | Others | PA, Beaver Co, Ambridge, American Bridge Co |
| 4 | Others | PA, Berks Co, Reading, Carpenter Steel Co |
| 1 | Others | PA, Berks Co, Reading, W. T. Grant Co |
| 1 | Others | PA, Berks Co, Robesonia, General Electric |
| 1 | Others | PA, Blair Co, Altoona, Pennsylvania State Highway Department |
| 1 | Others | PA, Blair Co, Altoona, W. T. Grant Co |
| 4 | Others | PA, Cambria Co, Johnstown, Cambria Steel Co |
| 7 | Others | PA, Carbon Co, Lansford, Lehigh Coal and Navigation Co |
| 23 | Others | PA, Carbon Co, Palmerton, New Jersey Zinc Co |
| 1 | Others | PA, Chester Co, Coatesville, YMCA |
| 5 | Others | PA, Chester Co, Phoenixville, Phoenix Bridge Co |
| 1 | Others | PA, Clinton Co, Lock Haven, YMCA |
| 3 | Others | PA, Columbia Co, Berwick, American Car and Foundry Co |
| 1 | Others | PA, Crawford Co, Titusville, Dravo Contracting Co |
| 1 | Others | PA, Dauphin Co, Harrisburg, American Telephone and Telegraph Co |
| 2 | Others | PA, Dauphin Co, Harrisburg, Bell Telephone Co |
| 4 | Others | PA, Dauphin Co, Harrisburg, Harrisburg Pipe and Pipe Bending Co |
| 5 | Others | PA, Dauphin Co, Harrisburg, Pennsylvania State Highway Department |
| 1 | Others | PA, Dauphin Co, Harrisburg, Pennsylvania Steel Co |
| 18 | Others | PA, Dauphin Co, Steelton, Bethlehem Steel Co |
| 14 | Others | PA, Dauphin Co, Steelton, Pennsylvania Steel Co |
| 1 | Others | PA, Delaware Co, Chester, YMCA |
| 1 | Others | PA, Erie Co, Erie, Anti-Saloon League |
| 5 | Others | PA, Erie Co, Erie, General Electric |
| 1 | Others | PA, Erie Co, Erie, Travelers Insurance Co |
| 1 | Others | PA, Erie Co, Erie, W. T. Grant Co |
| 1 | Others | PA, Forest Co, Marienville, US Forest Service |
| 1 | Others | PA, Franklin Co, Chambersburg, YMCA |
| 1 | Others | PA, Fulton Co, McConnellsburg, US Pension Bureau |
| 2 | Others | PA, Lackawanna Co, Carbondale, Delaware and Hudson Canal Co |
| 1 | Others | PA, Lackawanna Co, Scranton, Delaware and Hudson Canal Co |
| 1 | Others | PA, Lackawanna Co, Scranton, Pennsylvania State Highway Department |
| 3 | Others | PA, Lackawanna Co, Scranton, YMCA |
| 1 | Others | PA, Lancaster Co, Lancaster, YWCA |
| 1 | Others | PA, Lawrence Co, New Castle, Lehigh Portland Cement Co |
| 1 | Others | PA, Lawrence Co, New Castle, YMCA |
| 1 | Others | PA, Lebanon Co, Lebanon, Bethlehem Steel Co |
| 2 | Others | PA, Lebanon Co, Lebanon, Pennsylvania Steel Co |
| 4 | Others | PA, Lehigh Co, Allentown, American Steel and Wire Co |
| 1 | Others | PA, Lehigh Co, Allentown, International Motor Co |
| 5 | Others | PA, Lehigh Co, Bethlehem, Guerber Engineering Co |
| 1 | Others | PA, Lehigh Co, Coplay, Atlas Portland Cement Co |
| 1 | Others | PA, Lehigh Co, Stiles, Lehigh Portland Cement Co |
| 1 | Others | PA, Luzerne Co, Drifton, Lehigh Valley Coal Co |
| 2 | Others | PA, Luzerne Co, Hazleton, Lehigh Valley Coal Co |
| 1 | Others | PA, Luzerne Co, Wilkes-Barre, Bell Telephone Co |
| 9 | Others | PA, Luzerne Co, Wilkes-Barre, Lehigh Valley Coal Co |
| 1 | Others | PA, Luzerne Co, Wilkes-Barre, Pennsylvania State Highway Department |
| 1 | Others | PA, Lycoming Co, Williamsport, Philadelphia and Reading Coal and Iron Co |
| 1 | Others | PA, Lycoming Co, Williamsport, US Rubber Co |
| 1 | Others | PA, McKean Co, Bradford, YMCA |
| 2 | Others | PA, Mercer Co, Farrell, Carnegie Steel Co |
| 7 | Others | PA, Montgomery Co, Pencoyd, American Bridge Co |
| 1 | Others | PA, Montgomery Co, Pottstown, McClintic-Marshall Construction Co |
| 1 | Others | PA, Northampton Co, Bethlehem, Bell Telephone Co |
| 2 | Others | PA, Northampton Co, Bethlehem, Guerber Engineering Co |
| 5 | Others | PA, Northampton Co, Bethlehem, Weston Dodson and Co |
| 4 | Others | PA, Northampton Co, Easton, Ingersoll-Rand Co |
| 1 | Others | PA, Northampton Co, Freemansburg, New Jersey Zinc Co |
| 2 | Others | PA, Northampton Co, Northampton, Atlas Portland Cement Co |
| 1 | Others | PA, Northampton Co, Redington, Bethlehem Steel Co |
| 121 | Others | PA, Northampton Co, South Bethlehem, Bethlehem Steel Co |
| 4 | Others | PA, Northampton Co, South Bethlehem, Lehigh Coke Co |
| 1 | Others | PA, Philadelphia Co, Germantown, Western Electric Co |
| 24 | Others | PA, Philadelphia Co, Philadelphia |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Aberthaw Construction Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Agricultural Chemical Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Bible Society |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Blower Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Bridge Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Sugar Refining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Tract Society |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Writing Paper Co |
| 6 | Others | PA, Philadelphia Co, Philadelphia, Baldwin Locomotive Works |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Barrett Manufacturing Co |
| 10 | Others | PA, Philadelphia Co, Philadelphia, Bell Telephone Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Bradstreet Co |
| 6 | Others | PA, Philadelphia Co, Philadelphia, Electric Storage Battery Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Forbes Lithograph Manufacturing Co |
| 10 | Others | PA, Philadelphia Co, Philadelphia, General Electric |
| 2 | Others | PA, Philadelphia Co, Philadelphia, George A. Fuller Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Goodyear Tire and Rubber Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, International Motor Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Lanston Monotype Machine Co |
| 4 | Others | PA, Philadelphia Co, Philadelphia, Link Belt Co |
| 12 | Others | PA, Philadelphia Co, Philadelphia, Midvale Steel Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Pennsylvania State Highway Department |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Pennsylvania Steel Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Philadelphia and Reading Coal and Iron Co |
| 9 | Others | PA, Philadelphia Co, Philadelphia, Philadelphia Electric Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Pullman Palace Car Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Trussed Concrete Steel Co |
| 6 | Others | PA, Philadelphia Co, Philadelphia, United Gas Improvement Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, United Shoe Machinery Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, US Customs Service |
| 1 | Others | PA, Philadelphia Co, Philadelphia, US Department of Agriculture |
| 1 | Others | PA, Philadelphia Co, Philadelphia, US Department of Interior |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Western Union Telegraph Co |
| 7 | Others | PA, Philadelphia Co, Philadelphia, Westinghouse Electric and Manufacturing Co |
| 7 | Others | PA, Philadelphia Co, Philadelphia, YMCA |
| 2 | Others | PA, Schuylkill Co, Pottsville, Philadelphia and Reading Coal and Iron Co |
| 1 | Others | PA, Warren Co, Warren, Pennsylvania State Highway Department |
| 4 | Others | PA, Washington Co, Canonsburg, Fort Pitt Bridge Works |
| 1 | Others | PA, Washington Co, Charleroi, Anti-Saloon League |
| 1 | Others | PA, Washington Co, Donora, American Steel and Wire Co |
| 5 | Others | PA, Westmoreland Co, Latrobe, Railway Steel Spring Co |
| 2 | Others | PA, Westmoreland Co, Vandergrift, American Sheet and Tin Plate Co |
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