| Reference | {Deposit:: CROWLEY, F. A., 1960 , COLUMBIUM-RARE EARTH DEPOSITS, SOUTHERN RAVALLI CO., MONT., MONT. BUR. OF MINES & GEOLOGY, BULL 18 , P. 39 .}{Deposit:: BERG, R. B., 1977 , RECONNAISSANCE GEOLOGY OF SOUTHERNMOST RAVALLI CO., MONT., MONT. BUR. OF MINES & GEOL., MEM. 44 , P. 35 .}{Deposit:: 1960 GEOLMAP M. B. OF M. & GEOL., BULL 1} |