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. | |
| RI47 Ages of the Bethany, Beaverdam, and Omar Formations of Southern Delaware | Groot, J.J., Ramsey, K.W., Wehmiller, J.F. | |
| SP10 Selected Papers on the Geology of Delaware | Jordan, R.R., Pickett, T.E., Kraft, J.C., Sheridan, R.E., Spoljaric, N., Thompson, A.M., Woodruff, K.D., Varrin, R.D., Leavens, P.B., Carey, W.L. | |
| RI7 An Invertebrate Macrofauna from the Upper Cretaceous of Delaware | Shapiro, E., Richards, H.G. | |
| B7 Engineering Materials of Northern New Castle County | Ward, R.F., Groot, J.J. | |
| B3 Marine Upper Cretaceous Formations of the Chesapeake and Delaware Canal | Organist, D.M., Richards, H.G., Groot, J.J. |