| OFR50 Database of Quaternary Coastal Geochronologic Information for the Atlantic and Pacific Coasts of North America (additional information for sites in Peru and Chile) |
Wehmiller, J.F., Pellerito, V. |
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| RI55 Geology of the Milford and Mispillion River Quadrangles |
Ramsey, K.W., Groot, J.J. |
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| RI50 Plant Microfossils of the Calvert Formation of Delaware |
Groot, J.J. |
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| RI47 Ages of the Bethany, Beaverdam, and Omar Formations of Southern Delaware |
Groot, J.J., Ramsey, K.W., Wehmiller, J.F. |
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| B7 Engineering Materials of Northern New Castle County |
Ward, R.F., Groot, J.J. |
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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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