| GM17 Geologic Map of the Harbeson Quadrangle, Delaware |
Ramsey, K.W., Tomlinson, J.L. |
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| OFR31 The Storm of July 5, 1989: Hydrologic Conditions |
Talley, J.H. |
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| OFR18 A Numerical Indicator of Water Conditions for Northern Delaware |
Jordan, R.R., Woodruff, K.D. |
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| OFR13 Delaware's Extractive Mineral Industry |
Doyle, R.G., Pickett, T.E. |
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| RI9 Ground-Water Levels in Delaware January, 1962 - June, 1966 |
Woodruff, K.D. |
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| B7 Engineering Materials of Northern New Castle County |
Ward, R.F., Groot, J.J. |
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