DGS Publications
| Title | Authors | Publication Date |
|---|---|---|
| RI55 Geology of the Milford and Mispillion River Quadrangles | Ramsey, K.W., Groot, J.J. | |
| RI50 Plant Microfossils of the Calvert Formation of Delaware | Groot, J.J. | |
| OFR24 Saturated Thickness of the Water-Table Aquifer in Southern New Castle County, Delaware | Demicco, P.M., Groot, J.J., Cherry, P.J. | |
| B3 Marine Upper Cretaceous Formations of the Chesapeake and Delaware Canal | Organist, D.M., Richards, H.G., Groot, J.J. |