1924. Maryland Geological Survey. Shows the topography and election districts of Allegany County, Maryland. Waterways and man-made features such as roads, railroads, bridges, and bu... Maryland Geological Survey (Baltimoré).
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1917. Maryland Geological Survey. Copyrighted by Maryland Geological Survey, 1910.; "Based on surveys made in cooperation with the United States Geological Survey."; Insets: Elkton ... Maryland Geological Survey (Baltimore, Md.?).
1925. Maryland Geological Survey. Relief shown by contours. 66 x 91 centimeters Scale 1:62,500 General Map Collection. A. Hoen & Co (Baltimore).