U. S. Government Land at Fort Wadsworth, New York Harbor - Plan of Defenses on Staten Island at the Narrows (NAID 137929590)
item in the National Archives and Records Administration's holdings
National Archives at College Park - Cartographic
National Archives and Records Administration
Records of the Office of the Chief of Engineers (NAID 406)
War Department Map Collection (NAID 305808)
U. S. Government Land at Fort Wadsworth, New York Harbor - Plan of Defenses on Staten Island at the Narrows