Spherical Projections. No 100 / by R.E. ; by Robert Erskine F.R.S. Geogr. A. U.S. and Assistants, first sheet

Collection of unfinished military topographic maps. The coordinates describe much of New Jersey but, aside from the coordinate grid itself, only small areas about Elizabethtown and Amboy, New Jersey, and about Warwick and Chester, New York, were ever mapped onto it. Title proper from recto of 1st sheet is the work of a later editor--Simeon DeWitt or his assign--subsequent to 1820. Index title, both statements of responsibility, date, scale statement, series title and series numbering by Erskine, but on separate index sheet filed at head of series. Pen-and-ink, pencil on laid paper. Watermarks: "J WHATMAN" with crest and pendent initials "G R". Soiled, foxed, creased, frayed and abraded. 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 pencil on rectos: "No 100 1st" "No 100 2nd". In pencil on verso of second sheet: "Surveys made by Geographers of Continental Army".