RI55 Geology of the Milford and Mispillion River Quadrangles |
Ramsey, K.W., Groot, J.J. |
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RI53 Geology of the Seaford Area, Delaware |
Andres, A.S., Ramsey, K.W., Groot, J.J. |
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SP19 Delaware: Its Rocks, Minerals, and Fossils |
DGS Staff |
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RI50 Plant Microfossils of the Calvert Formation of Delaware |
Groot, J.J. |
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SP7 Selected Fossil Collecting Locations in Delaware and Minerals in Delaware |
DGS Staff |
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B3 Marine Upper Cretaceous Formations of the Chesapeake and Delaware Canal |
Organist, D.M., Richards, H.G., Groot, J.J. |
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