@book{26370,
	author = {Littlefield, Max Sylvan,},
	title = {Preliminary report of an investigation of the molding sand resources of Illinois,},
	year = {1925.},
	series = {Illinois. State geological survey. Report of investigations,},
	address = {Urbana,},
	note = {At head of title: State of Illinois. Dept. of registration and education. Division of State geological survey.}
}