DGS Publications
| Title | Authors | Publication Date |
|---|---|---|
| GM27 Geologic Map of the Elkton, Saint Georges, and Delaware City Quadrangles, Delaware | Tomlinson, J.L., Ramsey, K.W. | |
| RI55 Geology of the Milford and Mispillion River Quadrangles | Ramsey, K.W., Groot, J.J. | |
| OFR13 Delaware's Extractive Mineral Industry | Doyle, R.G., Pickett, T.E. |