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Subregions of Maryland with a brief Description of the Geologic and Hydrologic Factors Pertaining to Subsurface Waste Storage
(Baltimore: Maryland Geological Survey, 1970)
This map is Figure 4 from Otton, E.G., “Geologic and Hydrologic Factors Bearing on Subsurface Storage of Liquid Wastes in Maryland”. Baltimore: Maryland Geological Survey, 1970 (Report of Investigations No. 14).