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Map of Maryland Showing Geological Formations
(Baltimore: Maryland Geological Survey, 1933)
Scale 1:380,160. Size of original printed map height 42.25 inches, width 24.5 inches.
Map of Maryland Showing Surface Elevation
(Maryland Geological Survey, 1935)
Scale 1:380,160. Size of original printed map height 25 inches, width 43 inches.