Extent and Structure Contour Map of the Pittsburgh Coal Bed in the Potomac and Georges Creek Basins, Allegany and Garrett Counties, Maryland
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U.S. Geological Survey (1988)This series of orthophoto quadrangles covers the Chesapeake Bay area of Maryland, including the tidal reaches of the major bay tributaries. The source documents were produced by the U.S. Geological Survey from 1988-1989 ...
U.S. Geological Survey (1898)
Wilson, J.M.; Bachman, L.J. (Baltimore: Maryland Geological Survey, 1984)This map is Plate 1-2 from Bachman, L.J., and Wilson, J.M., “The Columbia Aquifer of the Eastern Shore of Maryland”. Baltimore: Maryland Geological Survey, 1984 (Report of Investigations No. 40).