00777cam a22002411 4500 gs 58000186 DLC 20260227111406.0 770801s1958 mouab b 000 0 eng c gs 58000186 (OCoLC)3152849 U. S. Geol. Survey Libr. TxCM TxCM DLC premarc QE131 .A25 no. 23 552.52 Herold, Paul George, 1909- Study of Missouri shales for lightweight aggregate, by P. G. Herold [and others] Rolla, 1958. 39 p. illus., map. 23 cm. Missouri. Division of Geological Survey and Water Resources. Report of investigations, no. 23 Bibliography: p. 39. Shale Missouri. 29254 29254