DGS Publications
| Title | Authors | Publication Date |
|---|---|---|
| RI55 Geology of the Milford and Mispillion River Quadrangles | Ramsey, K.W., Groot, J.J. | |
| B7 Engineering Materials of Northern New Castle County | Ward, R.F., Groot, J.J. |
Geologic and hydrologic research and exploration for Delaware