00968cam a22002531 4500 gs 48000080 DLC 20260227111354.0 790801s1948 mtua 000 0 eng c gs 48000080 (OCoLC)5229031 U.S. Geol. Survey TxEU DLC premarc QE391.S5 H4 Heinrich, E. William (Eberhardt William), 1918- Deposits of the sillimanite group of minerals south of Ennis, Madison County, with notes on other occurrences in Montana. Butte, Montana School of Mines, 1948. iii, 22 p. illus., plate, 28 cm. Montana. Bureau of Mines and Geology. Miscellaneous contribution no. 10 "References": p. 21-22. Sillimanite. Mines and mineral resources Montana Madison County. Montana Bureau of Mines and Geology. Miscellaneous contribution ; no. 10. 28266 28266