00787cam a22002411 4500 gs 33000403 DLC 20260227111338.0 790609s1921 wiua c s000 0 eng gs 33000403 (OCoLC)5051053 DLC TxCM DLC premarc QE179 .A2 no. 63 Thwaites, F. T. (Fredrik Turville), 1883-1961. Educational collection of Wisconsin rocks, by Fredrik T. Thwaites. Madison, Wis., Published by the state, 1921. 33 p. incl. tables. Wisconsin Geological and Natural History Survey. Bulletin no. 63 Educational series no. 7 Rocks Catalogs and collections. Petrology Wisconsin. 27053 27053