Author
ADC (Firm)
15
Baist, G. Wm. 1859-1927
11
Hopkins, Griffith Morgan, Jr
9
A.H. Mueller & Co
8
Bromley, George Washington
8
Bromley, Walter Scott
8
G.M. Hopkins & Co
8
Pennsylvania. Department of Conservation and Natural Resources
8
Mueller, A. H.
7
Beers, F. W.
6
Kiser, Ellis
6
Pennsylvania
6
Smith, Elvino V., 1870-1932
6
Alexandria Drafting Company
5
Phlash (Firm : Philadelphia, Pa.)
5
Geological Survey of Pennsylvania
4
Lathrop, J. M.
4
MacInnes, Sharon Cook
4
Nichols, Beach
4
Pennsylvania. Bureau of Topographic and Geologic Survey
4
Philadelphia Transportation Company
4
Smith, J. L.
4
G.W. Bromley & Co
3
Historical Society of Pennsylvania
3
Marian S. Carson Collection (Library of Congress)
3
Mural Arts Program (Philadelphia, Pa.)
3
Ogier, St. Julian
3
Pennsylvania. Department of Commerce
3
Philadelphia & Reading Railroad Co
3
Philadelphia (Pa.). Office of the Managing Director
3
Rand McNally and Company
3
Scott, James D.
3
Southeastern Pennsylvania Transportation Authority
3
Allen, Lane & Scott
2
American Imprint Collection (Library of Congress)
2
American Philosophical Society
2
Beers, D. G.
2
Beetem, Charles Gilbert
2
Big Bus Company of Pennsylvania
2
Bowen, John S.
2
Busch, Edward
2
Cate, Addison S.
2
DeLorme Mapping Company
2
Delaware and Schuylkill Canal Company
2
Dodge, Clifford H.
2
Duportail, Antoine-Jean-Louis Le Bègue de Presle, 1743-1802
2
E.P. Noll & Co
2
Everts & Stewart
2
Fairmount Park Commission (Philadelphia, Pa.)
2
Fernon, Thomas S. 1818-1896
2
more ...