01062cam a2200277 4500 gs 66000313 DLC 20260227111420.0 690710s1966 aluabc b 00010 eng c gs 66000313 //r932 U.S. Geol. Survey. Library DLC DLC TN942 .C55 553/.61/09761 Clarke, Otis M. Clay and shale of northwestern Alabama, by Otis M. Clarke, Jr. University, Ala., Geological Survey of Alabama, Division of Economic Geology, 1966. 88 p. illus., maps (part col., 1 fold. in pocket) port. 23 cm. Geological Survey of Alabama. Circular 20B Prepared in cooperation with the Bureau of Mines, U.S. Dept. of the Interior. Bibliography: p. 33-34. Clay Alabama. Shale Alabama. Geological Survey of Alabama. Economic Geology Division. United States. Bureau of Mines. Circular (Geological Survey of Alabama) ; 20B. 30276 30276