Author
Geological Survey (U.S.)
11
Geological Survey (U.S.),
4
Delaware. Department of Natural Resources and Environmental Control
3
Delaware Geological Survey
2
Lacombe, Pierre
2
Maryland Geological Survey
2
New Jersey. Department of Environmental Protection
2
United States. Army. Corps of Engineers
2
Barbaro, Jeffrey R. 1960-
1
Boardman, Leona, 1894-1957
1
Carpenter, David H. (Hydrologist)
1
Carpenter, David H. (Hydrologist),
1
Cook, David W., 1931-
1
Delaware. Department of Transportation
1
Dillow, Jonathan J. A.,
1
Dover Air Force Base (Del.)
1
Duran, Philip B.
1
Fleck, William B.
1
Gutiérrez-Magness, Angélica L.
1
Hayes, Donald C.
1
Hayes, Donald C.,
1
Martin, M. M.
1
Maryland. Water Resources Administration
1
Mowbray, William W., 1940-
1
National Geographic Magazine
1
National Geographic Society (U.S.). Cartographic Division
1
Paulachok, Gary N.
1
Paulachok, Gary N.,
1
Peele, William T.
1
Raffensperger, Jeffrey Peter, 1963-
1
Rosman, Robert
1
Rosman, Robert,
1
Simmons, Robert H.
1
Simmons, Robert H.,
1
Tallman, Anthony J.
1
Tallman, Anthony J.,
1
United States. Air Force
1
Vroblesky, Don A.
1
Water Resources Council (U.S.)
1