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    • Geologic map of Baltimore County and City 

      Crowley, William Patrick (Baltimore : State of Maryland, Maryland Geological Survey, 1976)
      1 map : colored ; 102 x 112 cm. Scale 1:62,500 (W 76°55ʹ--W 76°17ʹ/N 39°43ʹ--N 39°09ʹ).