A survey of the defile and that part of York Island adjacent to Fort Knyphausen / surveyed and drawn by Lieut. George Sproule of the 16th Regt. of Foot assist. engineer.
Finished, colored, topographical map of the area around the former Fort Washington, captured and renamed by the British in 1776.; Nearby barracks and fortifications are shown.; Endorsed at lower right: Alexr. Mercer, commg engineer.
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