1925. Maryland Geological Survey. Relief shown by contours. 66 x 91 centimeters Scale 1:62,500 General Map Collection. A. Hoen & Co (Baltimore).
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1925. National Geographic Society (U.S.). Map Department. Relief shown by gradient tints and hachures.; Includes 3 inset maps.; Inset maps: Washington and vicinity -- Baltimore and vicinity --Wilmington an... National Geographic Society (Washington, D.C).