RI50 Plant Microfossils of the Calvert Formation of Delaware |
Groot, J.J. |
|
RI47 Ages of the Bethany, Beaverdam, and Omar Formations of Southern Delaware |
Groot, J.J., Ramsey, K.W., Wehmiller, J.F. |
|
OFR25 Saturated Thickness of the Columbia Formation in Southern New Castle County, Delaware |
Groot, J.J., Demicco, P.M., Cherry, P.J. |
|
RI34 Long-Term Chemical-Quality Changes in Selected Delaware Streams |
McKenzie, S.W. |
|
B2 Geology and Ground-Water Resources of the Newark Area, Delaware with a Section on the Surface Water Resources |
Groot, J.J., Rasmussen, W.C., Hulme, A.E. |
|