Also on verso: "60.48 29.12," minor unfinished sketch. Foxed, creased, abraded and badly frayed. Mounted on cloth, bound and cropped, disbound and silked by subsequent owners. Cleaned after removal of backings 1999; some fill remains. Sheathed in mylar. In ink on verso: N.1.D. Military fortification map. Covers Fort Plum Point, near modern Cornwall-on-Hudson in the town of New Windsor, Orange County, New York. Butter Hill is now called Storm King Mountain; it overlooks the mapped area from the southeast. Nichol’s Hill has not been identified. Neither peak is shown on the map. Map does show roads, fort and other buildings, also landforms and streams. No watermark. Pen-and-ink, pencil on laid paper. Shows relief by hachures. Title proper from recto is the work of a later editor--Simeon DeWitt or his assign--subsequent to 1820. Index title, statement of responsbility, date, series title and series numbering by Erskine, but on separate index sheet filed at head of series. Secondary statement of responsibility on map recto.