@book{28385,
	author = {Grohskopf, John Gustave, and McCracken, Earl,},
	title = {Insoluble residues of some Paleozoic formations of Missouri,},
	year = {1949.},
	series = {Missouri. Dept. of Business and Administration. Division of Geological Survey and Water Resources. Report of investigations,},
	address = {Rolla,}
}