Geologic map of the Union Bridge Quadrangle, Carroll and Frederick 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 ...
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).
Geologic map of Benedict quadrangle, Calvert, Prince George's, Charles and St. Mary's counties, Maryland Glaser, John D. (Baltimore : Maryland Geological Survey, 2002)1 map : colored ; 58 x 46 cm. on sheet 90 x 92 cm. Scale 1:24,000