Reference | {Deposit:: STATE OF ORE. DEPT. OF GEOL. & MIN. INDUS. BULL. #6, PRELIMINARY REPORT OF SOME OF THE REFRACTORY CLAYS OF WESTERN OREGON, BY HEWITT WILSON AND RAY C. TREASHER, 1938 PG. 82}{Deposit:: OR. DEPT. GEOL. AND MIN. INDUST. BULLETIN 14-C, 1943, V. 2, P. 198.} |