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.
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.