@book{29438,
	author = {Withington, Charles F. and Jaster, Marion C.},
	title = {Selected annotated bibliography of gypsum and anhydrite in the United States and Puerto Rico /},
	publisher = {U.S. G.P.O.,},
	year = {1960.},
	address = {Washington, [D.C.] :},
	note = {Includes index.}
}