Reference | {Deposit:: AUSTIN, G.S., 1963, GEOLOGY OF CLAY DEPOSITS; RED WING AREA, GOODHUE AND WABASHA COUNTIES, MINNESOTA, MN GEOLOGICAL SURVEY R.I. 2}{Deposit:: GROUT, F.F., 1919, CLAYS AND SHALES OF MINNESOTA; U.S.G.S. BULL. 678.}{Deposit:: 1919 COMPILA GROUT, F.F., AND SOPER, E.K., BULLETIN 67} |