| Reference | {Deposit:: U.S. BUREAU OF MINES, 1980, SAND AND GRAVEL INDIVIDUAL RESPONDENT TOTALS IN COUNTIES OF ALABAMA: U.S. BUREAU OF MINES UNPUBLISHED DATA, 4 P.}{Deposit:: SZABO, M.W., 1967, SAND AND GRAVEL IN ALABAMA: ALABAMA GEOLOGICAL SURVEY CIRC. 44, 44 P.}{Deposit:: DAVIS, E.G., AND SULLIVAN, G.V., 1971, RECOVERY OF HEAVY MINERALS FROM SAND AND GRAVEL OPERATIONS IN SOUTHEASTERN U.S.: U.S. BUREAU OF MINES REPT. INV. 7517, 25 P.}{Production:: U.S. BUREAU OF MINES, 1980, SAND AND GRAVEL UNPUB. DATA, P. 3.} |