@book{92167,
	author = {Prussia. and Abel, Charles,},
	title = {Regulations for field fortifications /},
	publisher = {Press of the Engineer School,},
	year = {1911.},
	series = {Occasional papers / Engineer School, U.S. Army ;},
	address = {Washington Barracks, D.C. :},
	note = {Regulations for field fortifications to take the place of the corresponding regulations of April 6, 1893, dated 28th of June, 1906.}
}