| Reference | {Deposit:: SIMPSON, T.A., 1965, GEOLOGIC AND HYDROLOGIC STUDIES IN THE BIRMINGHAM RED IRON ORE DISTRICT, ALABAMA: U.S. GEOLOGICAL SURVEY PROF. PAPER 473-C, 47P.}{Deposit:: SIMPSON, T.A., AND GRAY, T.R., 1970, THE BIRMINGHAM RED ORE DISTRICT, ALABAMA: IN RIDGE, I.D. (ED) ORE DEPOSITS OF THE UNITED STATES, 1933-1973. AIME, NEW YORK.} |