| Most Recent Entries |
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| 1 | Others | PA, , Germantown, Nymo Zinc and Lead Co |
| 2 | Others | PA, , MWCR Marshfield Base Station |
| 1 | Others | PA, , Newtown, MWCR Summit House |
| 1 | Others | PA, Allegheny Co, Crafton, Sturdy Gold Mining Co |
| 1 | Others | PA, Allegheny Co, Gibsonia, MWCR Marshfield Base Station |
| 1 | Others | PA, Allegheny Co, Ingomar, MWCR Summit House |
| 3 | Others | PA, Allegheny Co, Pittsburgh, American Spiral Spring Manufacturing Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Arizona and Butte Copper Mining Co |
| 2 | Others | PA, Allegheny Co, Pittsburgh, Brush Electric Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, C. A. Turner |
| 5 | Others | PA, Allegheny Co, Pittsburgh, Central District and Printing Telegraph Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Central Lumber Co |
| 5 | Others | PA, Allegheny Co, Pittsburgh, Central Traction Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Citizens Traction Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Faraday Carbon Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Fidelity and Casualty Co of New York |
| 5 | Others | PA, Allegheny Co, Pittsburgh, Hussey-Howe Mining Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Iron City Electrical Supply Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, La Luz and Los Angeles Mining Co |
| 5 | Others | PA, Allegheny Co, Pittsburgh, Michales Electric Mining Machine Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Mill and Mine Electric Equipment Co |
| 2 | Others | PA, Allegheny Co, Pittsburgh, Mineral Hill Consolidated Copper Co |
| 2 | Others | PA, Allegheny Co, Pittsburgh, National Electric Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, National Mines and Smelter Co |
| 16 | Others | PA, Allegheny Co, Pittsburgh, National Tube Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Newport and Cincinnati Bridge Co |
| 11 | Others | PA, Allegheny Co, Pittsburgh, North American Construction Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Old Eureka Mining Co |
| 2 | Others | PA, Allegheny Co, Pittsburgh, Orr and Howe Electric Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh and Birmingham Traction Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh and Mount Shasta Gold Mining and Milling Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh Idaho Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh Lead Mining Co |
| 3 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh Reflector and Illuminating Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh Traction Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pittsburgh-Dolores Mining Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Pittsmont Copper Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Princemont Mining Co |
| 4 | Others | PA, Allegheny Co, Pittsburgh, San Toy Mining Co |
| 5 | Others | PA, Allegheny Co, Pittsburgh, Shenango Furnace Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Silver Knight Mine |
| 4 | Others | PA, Allegheny Co, Pittsburgh, Solar Carbon and Manufacturing Co |
| 6 | Others | PA, Allegheny Co, Pittsburgh, Spang, Chalfant and Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, Thomson-Houston Electric Co |
| 1 | Others | PA, Allegheny Co, Pittsburgh, United Metals and Power Co |
| 53 | Others | PA, Allegheny Co, Pittsburgh, Westinghouse Electric and Manufacturing Co |
| 14 | Others | PA, Allegheny Co, Pittsburgh, Westinghouse Electric Co |
| 1 | Others | PA, Allegheny Co, Sharpsburg, American Steel Hoop Co |
| 1 | Others | PA, Bradford Co, Canton, MWCR Summit House |
| 1 | Others | PA, Bucks Co, Doylestown, MWCR Marshfield Base Station |
| 1 | Others | PA, Bucks Co, Doylestown, MWCR Summit House |
| 3 | Others | PA, Bucks Co, Richboro, MWCR Summit House |
| 2 | Others | PA, Bucks Co, Warminster, MWCR Summit House |
| 1 | Others | PA, Bucks Co, Yardley, MWCR Marshfield Base Station |
| 1 | Others | PA, Butler Co, Butler, Larkin Co |
| 1 | Others | PA, Butler Co, Butler, Rock Rose Mining and Milling Co |
| 1 | Others | PA, Cambria Co, Johnstown, Copper King Mines Products Co |
| 1 | Others | PA, Cambria Co, Johnstown, Pennsylvania Molybdenum Mines Co |
| 3 | Others | PA, Chester Co, Devon, MWCR Marshfield Base Station |
| 4 | Others | PA, Columbia Co, Berwick, American Car and Foundry Co |
| 1 | Others | PA, Columbia Co, Bloomsburg, Bell Telephone Co |
| 48 | Others | PA, Crawford Co, Meadville, Allegheny College |
| 1 | Others | PA, Crawford Co, Meadville, Meadville Theological School |
| 6 | Others | PA, Cumberland Co, Carlisle, Dickinson College |
| 3 | Others | PA, Dauphin Co, Harrisburg, MWCR Marshfield Base Station |
| 4 | Others | PA, Dauphin Co, Harrisburg, Pennsylvania Telephone Co |
| 23 | Others | PA, Dauphin Co, Steelton, Pennsylvania Steel Co |
| 1 | Others | PA, Delaware Co, Bryn Mawr, MWCR Marshfield Base Station |
| 1 | Others | PA, Delaware Co, Newtown Square, MWCR Marshfield Base Station |
| 2 | Others | PA, Delaware Co, Radnor, MWCR Marshfield Base Station |
| 1 | Others | PA, Delaware Co, Ridley Park, MWCR Summit House |
| 2 | Others | PA, Delaware Co, Wallingford, MWCR Marshfield Base Station |
| 1 | Others | PA, Delaware Co, Wallingford, MWCR Summit House |
| 1 | Others | PA, Delaware Co, Wawa, MWCR Marshfield Base Station |
| 2 | Others | PA, Delaware Co, Wayne, MWCR Summit House |
| 1 | Others | PA, Erie Co, Erie, American Malting Co |
| 4 | Others | PA, Erie Co, Erie, Erie Electric Motor Co |
| 1 | Others | PA, Erie Co, Erie, MWCR Marshfield Base Station |
| 1 | Others | PA, Erie Co, Erie, MWCR Summit House |
| 1 | Others | PA, Erie Co, Erie, New York Security and Trust Co |
| 1 | Others | PA, Fayette Co, Dunbar, MWCR Summit House |
| 1 | Others | PA, Greene Co, Abington, MWCR Summit House |
| 1 | Others | PA, Lackawanna Co, Carbondale, MWCR Marshfield Base Station |
| 1 | Others | PA, Lackawanna Co, Scranton, International Correspondence School |
| 3 | Others | PA, Lackawanna Co, Scranton, Scranton Mining and Smelting Co |
| 1 | Others | PA, Lackawanna Co, Scranton, Square Deal Gold Mining Co |
| 3 | Others | PA, Lackawanna Co, Scranton, W. P. Connell and Sons |
| 1 | Others | PA, Lancaster Co, Lancaster, MWCR Summit House |
| 1 | Others | PA, Lancaster Co, Pittsburg, Pittsburg-Silver Peak Gold Mining Co |
| 1 | Others | PA, Lebanon Co, Lebanon, American Iron and Steel Manufacturing Co |
| 48 | Others | PA, Lehigh Co, Bethlehem, Lehigh University |
| 2 | Others | PA, Lehigh Co, Hokendauqua, Thomas Iron Co |
| 153 | Others | PA, Luzerne Co, Kingston, Wyoming Seminary |
| 3 | Others | PA, Luzerne Co, Pittston, Pittston Street Car Co |
| 1 | Others | PA, Luzerne Co, Plains, MWCR Marshfield Base Station |
| 4 | Others | PA, Luzerne Co, Wilkes-Barre, Kirwan Electrical Station Indicator Co |
| 1 | Others | PA, Luzerne Co, Wilkes-Barre, MWCR Marshfield Base Station |
| 2 | Others | PA, Lycoming Co, Williamsport, Central Pennsylvania Telephone and Supply Co |
| 1 | Others | PA, Lycoming Co, Williamsport, Susquehanna Mining Co |
| 1 | Others | PA, Mercer Co, Sharon, Republic Iron and Steel Co |
| 1 | Others | PA, Montgomery Co, Ardmore, MWCR Marshfield Base Station |
| 1 | Others | PA, Montgomery Co, Ardsley, MWCR Summit House |
| 1 | Others | PA, Montgomery Co, Blue Bell, MWCR Marshfield Base Station |
| 1 | Others | PA, Montgomery Co, Conshohocken, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Flourtown, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Gladwyne, MWCR Marshfield Base Station |
| 1 | Others | PA, Montgomery Co, Glenside, MWCR Marshfield Base Station |
| 3 | Others | PA, Montgomery Co, Glenside, MWCR Summit House |
| 1 | Others | PA, Montgomery Co, Gwynedd Valley, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Haverford, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Merion Station, MWCR Marshfield Base Station |
| 3 | Others | PA, Montgomery Co, Narberth, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Oreland, MWCR Marshfield Base Station |
| 2 | Others | PA, Montgomery Co, Oreland, MWCR Summit House |
| 3 | Others | PA, Northampton Co, Bethlehem, Bethlehem Steel Co |
| 4 | Others | PA, Northampton Co, Easton, Pennsylvania Motor Co |
| 1 | Others | PA, Northampton Co, South Bethlehem, American Ordnance Co |
| 1 | Others | PA, Philadelphia Co, Chestnut Hill, MWCR Marshfield Base Station |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Academy of Natural Sciences |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Algoma Steel Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, American Bridge Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Manganese Manufacturing Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Ordnance Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, American Venture and Mines Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Amparo Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Arizona United Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Automatic Fire Alarm and Extinguisher Co |
| 11 | Others | PA, Philadelphia Co, Philadelphia, Bell Telephone Co of Philadelphia |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Belmont Surf Inlet Mines |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Belmont Wagner Mining Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Big Casino Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Black Pine Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Boston-Moctezuma Mining Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Brush Electric Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, C. and C. Electric Motor Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Calavada Copper Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Chadbourne, Hazelton and Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Clearfield Bituminous Coal Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Colorado-Gilpin Gold and Radium Mining Co |
| 4 | Others | PA, Philadelphia Co, Philadelphia, De Kosenko and Hetherington Manufacturing Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, El Tiro Copper Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Electric Cable Construction and Maintenance Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Electric Protection Co |
| 4 | Others | PA, Philadelphia Co, Philadelphia, Electro-Dynamic Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Equitable Electric Railway Construction Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Erie Telegraph and Telephone Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Fidelity and Casualty Co of New York |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Fort Wayne Electric Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Franklin Institute |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Goldfield Bull Dog Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Guanajuato Reduction and Mines Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Happy Jack Mining and Reduction Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Internal Revenue Service |
| 8 | Others | PA, Philadelphia Co, Philadelphia, Investment Co of Philadelphia |
| 3 | Others | PA, Philadelphia Co, Philadelphia, J. H. Lehman and Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Kimberly Consolidated Mines Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, King Solomon Copper Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Liberty Group |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Magnate Copper Co |
| 4 | Others | PA, Philadelphia Co, Philadelphia, Methodist Hospital |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Mining Development Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Minnesota-Connor Mining and Milling Co |
| 23 | Others | PA, Philadelphia Co, Philadelphia, MWCR Marshfield Base Station |
| 11 | Others | PA, Philadelphia Co, Philadelphia, MWCR Summit House |
| 1 | Others | PA, Philadelphia Co, Philadelphia, National Electric Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, National Tube Co |
| 6 | Others | PA, Philadelphia Co, Philadelphia, Navy Yard |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Nicaragua Mining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, North American Construction Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Novelty Electric Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Oscar Smith and Sons Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Partrick and Carter |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Pennsylvania Mining, Power and Reduction Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Pennsylvania Motor Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Philadelphia General Liquid Air Manufacturing and Refining Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Philadelphia Mines Co |
| 15 | Others | PA, Philadelphia Co, Philadelphia, Philadelphia Traction Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Postal Telegraph Co |
| 4 | Others | PA, Philadelphia Co, Philadelphia, Quaker City Electric Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Rhodes Manufacturing Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Sawyer-Man Electric Co |
| 3 | Others | PA, Philadelphia Co, Philadelphia, Shepherd Brothers |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Sioux Falls Gas Light Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Susquehanna Coal Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Tecopa Consolidated Mining Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Thomas Potter Sons and Co |
| 369 | Others | PA, Philadelphia Co, Philadelphia, University of Pennsylvania |
| 1 | Others | PA, Philadelphia Co, Philadelphia, US Electric Lighting Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, US Platinum Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Virginia-Carolina Chemical Co |
| 1 | Others | PA, Philadelphia Co, Philadelphia, Walker Electric Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Westinghouse Electric Co |
| 2 | Others | PA, Philadelphia Co, Philadelphia, Wilson Brothers |
| 9 | Others | PA, Philadelphia Co, Philadelphia, Young, Smyth, Field Co |
| 1 | Others | PA, Philadelphia Co, Womans Medical College of PA |
| 1 | Others | PA, Schuylkill Co, Mahanoy City, American Express Co |
| 1 | Others | PA, Warren Co, Warren, Cashier Gold Mining and Reduction Co |
| 1 | Others | PA, Washington Co, Fredericktown, Clyde Supply Co |
| 1 | Others | PA, Washington Co, Washington, Monte Rico Mining and Milling Co |
| 1 | Others | PA, Washington Co, Washington, Trinity Hall |
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