@book{30276,
	author = {Clarke, Otis M. and Geological Survey of Alabama.},
	title = {Clay and shale of northwestern Alabama,},
	publisher = {Geological Survey of Alabama, Division of Economic Geology,},
	year = {1966.},
	series = {Geological Survey of Alabama. Circular 20B},
	address = {University, Ala.,},
	note = {Prepared in cooperation with the Bureau of Mines, U.S. Dept. of the Interior.}
}