Walker, Paul K. Engineers of Independence: A Documentary History of the Army Engineers in the American Revolution, 1775-1783. Washington DC: US Government Printing Office, 1981.
6 x 9 inches, xii., 403 clean pp., illustrated. Very good. Paperback. 
"This collection of documents, including many previously unpublished, details the role of the Army engineers in the American Revolution." - Preface.