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

Public domain image of the vintage map from NYPL Lionel Pincus and Princess Firyal Map Division, free to use, no copyright restrictions image. The Lionel Pincus and Princess Firyal Map Division is one of the world’s premier map collections in terms of size, scope, unique holdings, diversity, and intensity of use. Established in 1898, our holdings include more than 433,000 sheet maps and 20,000 books and atlases - Picryl description