Mining, the priceless heritage Lewis, Robert Strong 1882- creator University of Utah Extension Division. text utu Salt Lake City Extension Division, University of Utah 1939 monographic eng
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36 p. ; 23 cm. by Robert Strong Lewis. At head of title: Extension Division, University of Utah. Mineral industries Mines and mineral resources TN155 .L4 Bulletin ; v. 29, no. 4 University of Utah. Frederick William Reynolds memorial lecture ; [no.] 3 e 39000094 DLC 800423 20260227111228.0 e 39000094