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    • Maryland, Delaware and the District of Columbia 

      O.W. Gray & Son (Philadelphia : O.W. Gray & Son, 1876)
      maps : colored, both sides ; 40 x 67 cm, 38 x 34 cm., an 44 x 35 cm, on sheet 44 x 72 cm. Scale of 1000 feet--one inch [ca. 1:12,000].