License, verbatimUS-PD
The New York Public Library states no known U.S. copyright for this item. Pinax admits it as US-PD only because the work predates 1900, making public domain near-certain worldwide; status outside the U.S. is not asserted and reuse elsewhere is the user's responsibility. Credit: From The New York Public Library.
Map showing a portion of the boundaries of Maryland, Pennsylvania, & Delaware : as surveyed in 1849 & '50, under the direction of Lieutenant Colonel J.D. Graham, U.S. Topl. Engineers, at the request of H.G.S. Key, Joshua P. Eyre, & Geo. Read Riddle, commissioners of the respective states. 1849 (from title). The New York Public Library.