Author
Pennsylvania Inspectors of Mines
6
Lehigh Coal and Navigation Company
5
Roberts, William F.
5
Alleghany Railroad and Coal Company
4
Pennsylvania Historical and Museum Commission
4
Arnold, Andrew Bernard
3
Ashburner, Charles A. 1854-1889
3
Daddow, Samuel Harries
3
Graebner, William
3
Hubbell & Patton Gold and Silver Co. (Philadelphia)
3
Little Schuylkill Navigation Rail Road and Coal Company
3
Pennsylvania
3
Philadelphia Record
3
Sheafer, P. W. 1819-
3
Taylor, Richard C. 1789-1851
3
United States. Bureau of Mines
3
Aurand, Harold W.
2
Baker, Ralph Hillis, 1910-
2
Bannan, Benjamin
2
Beránek, Karel H.,
2
Brydon, G. MacLaren 1875-1963
2
Conlogue, William,
2
Cunningham, John T.
2
Dickeson, Montroville Wilson
2
Eavenson, Howard N.
2
Ely, John
2
Frémont, John Charles, 1813-1890
2
Henfrey, Benjamin
2
Hornblower, Josiah, 1729-1809
2
Hubbell, William Wheeler, 1821-1902
2
Ingham, Charles F.
2
Kulp, Geo. B. 1839-1915
2
Langdon, Emma Florence, 1874-
2
Lehigh Coal and Navigation Co
2
Lesley, John Peter, 1819-1903
2
Long, Michael E.
2
Markham, Edwin, 1852-1940
2
Maxwell, Volney L., 1804-1873
2
Maxwell, Volney Lee, 1804-1873
2
Mill Creek Coal Co
2
New Jersey Tercentenary Commission
2
Nicolls, William Jasper, 1854-1916
2
O'Brien, Michael
2
Pennsylvania Anthracite Coal Industry Commission
2
Pennsylvania Commission Appointed to Investigate the Bituminous Coal Mines
2
Pennsylvania. Board of Commissioners for the Second Geological Survey
2
Pennsylvania. Bureau of Topographic and Geologic Survey
2
Pennsylvania. General Assembly. Senate. Committee on the Judiciary
2
Sinclair, Upton, 1878-1968,
2
Sisler, James D.
2
more ...