Author
International Geological Congress
247
American Geophysical Union
104
Field Conference of Pennsylvania Geologists
32
Geological Association of Canada
20
International Association of Sedimentologists
17
Pennsylvania. Bureau of Topographic and Geologic Survey
17
World's Fairs and Expositions Collection (University of Pennsylvania)
17
Geological Survey of Pennsylvania
16
Sevon, William D.
14
Canadian Society of Petroleum Geologists
13
International Sedimentological Congress
13
International Congress on Carboniferous Stratigraphy and Geology
12
Atlantic Geoscience Society
11
Ústřední ústav geologický (Czech Republic)
11
Acadia University. Department of Earth Sciences
10
Geological Association of Canada-Mineralogical Association of Canada Joint Annual Meeting
10
Mineralogical Association of Canada
9
Centennial Exhibition
8
Inners, Jon D.
8
Halifax '80
7
Harper, John A.
7
World's Columbian Exposition
7
Field Conference of Pennsylvania Geologists Lancaster, Pa
6
Geological Survey (U.S.)
6
O'Connor, James V.
6
Vernacular Architecture Forum (U.S.)
6
Vernacular Architecture Forum Conference
6
Virginia Geology Field Conference
6
AAPG Annual Convention
5
Century of Progress International Exposition Chicago, Ill
5
Eggleston, Jane R.
5
Faill, Rodger T.
5
International Clay Conference
5
International Conference on Permafrost
5
Warwick, Peter D.
5
American Association of Petroleum Geologists. Energy Minerals Division
4
Aubourg, C. E.
4
Canadian Paleontology Conference
4
Centennial Exhibition Philadelphia, Pa
4
Congreso Geológico de España
4
Edmunds, William E.
4
Hardyman, Richard F.
4
International Congress of Prehistoric and Protohistoric Sciences
4
International Union of Prehistoric and Protohistoric Sciences
4
New York World's Fair
4
Willett, J. C.
4
Anthony, Robin
3
Berkheiser, Samuel W.
3
Braun, Duane D.
3
Colombo Piñol, Ferran
3
more ...