RI58 The Pliocene and Quaternary Deposits of Delaware: Palynology, Ages, and Paleoenvironments |
Groot, J.J., Jordan, R.R. |
|
RI50 Plant Microfossils of the Calvert Formation of Delaware |
Groot, J.J. |
|
SP17 The Delaware Geological Survey: The Formative Years, 1951-1969 |
Groot, J.J. |
|
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. |
|