@book{26910,
	author = {Butler, G. M. and Tenney, J. B.},
	title = {Petroleum,},
	publisher = {the University of Arizona,},
	year = {1931.},
	series = {Oil ser.},
	address = {Tucson,},
	note = {At head of title: University of Arizona bulletin, vol. 2: no. 1, March 1931.}
}