| Reference | {Deposit:: NICHOLS, R. L., 1944, PRELIMINARY REPORT ON THE MOLALLA HIGH-ALUMINA CLAY DEPOSIT NEAR MOLALLA, CLACKAMAS COUNTY, OREGON: U.S. GEOLOGICAL SURVEY STRATEGIC MINERALS INVESTI GATIONS.}{Deposit:: OR. DEPT. GEOL. AND MIN. INDUST. BULLETIN 14-D, 1951, P. 20.} |