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. | |
| GM26 Geologic Map of the Cecilton and Middletown Quadrangles, Delaware | Tomlinson, J.L., Ramsey, K.W. | |
| GM17 Geologic Map of the Harbeson Quadrangle, Delaware | Ramsey, K.W., Tomlinson, J.L. | |
| GM10 Bedrock Geologic Map of the Piedmont of Delaware and Adjacent Pennsylvania | Schenck, W.S., Plank, M.O., Srogi, L. |