| B19 Geology and Hydrology of the Cockeysville Formation Northern New Castle County, Delaware |
Plank, M.O., Woodruff, K.D., Werkheiser, W.H. |
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| RI50 Plant Microfossils of the Calvert Formation of Delaware |
Groot, J.J. |
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| RI47 Ages of the Bethany, Beaverdam, and Omar Formations of Southern Delaware |
Groot, J.J., Ramsey, K.W., Wehmiller, J.F. |
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| OFR14 Sinkholes, Hockessin Area, Delaware |
Talley, J.H. |
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| OFR13 Delaware's Extractive Mineral Industry |
Doyle, R.G., Pickett, T.E. |
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