Chemical composition of sedimentary rocks in Colorado, Kansas, Montana, Nebraska, North Dakota, South Dakota, and Wyoming. - Hill, Thelma P., 1917-; Werner, Marian A., 1935-; Horton, M. Julia, 1936- (Washington, U.S. Govt. Print. Off., 1967)
Part of illustrative matter folded in pocket.
Bibliography: p. 225-231.
Keywords: Sedimentary rocks; Rocks -- Analysis; Petrology -- West (U.S.)