Young, Neil B. Dawsonite and nahcolite analyses of Green River formation oil-shale sections, Piceance Creek Basin, Colorado - Washington Bureau of Mines 1970 - 22 p. il., 1 map 26 cm - RI 7445 . Subjects--Topical Terms: oil shale Subjects--Geographic Terms: Piceance Creek Basin [Colorado] Universal Decimal Class. No.: 55