DGS Publications
| Title | Authors | Publication Date |
|---|---|---|
| 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. | |
| RI7 An Invertebrate Macrofauna from the Upper Cretaceous of Delaware | Shapiro, E., Richards, H.G. | |
| B3 Marine Upper Cretaceous Formations of the Chesapeake and Delaware Canal | Organist, D.M., Richards, H.G., Groot, J.J. |