THE CLASSIFICATION OF THE WISCONSIN GLACIAL STAGE OF NORTH CENTRAL UNITED-STATES

[1] Alden W. C., 1917, IOWA GEOLOGICAL SURV, V26, P49

[2] ALDEN WC, 1918, 106 US GEOL SURV PRO

[3] BAKER FC, 1920, U ILLINOIS B, V17

[4] BEYER SW, 1897, IOWA ACADEMY SCI P, V4, P58

[5] BLACK RF, 1959, SCIENCE, V130, P172

[6] CHAMBERLIN TC, 1897, J GEOL, V5, P795, DOI DOI 10.1086/607964

[7] CHAMBERLIN TC, 1906, GEOLOGY, V3

[8] EKBLAW GE, 1946, GEOL SOC AM BULL, V57, P1189

[9] EKBLAW GE, 1955, ILLINOIS ACAD SCI T, V47, P129

[10] Flint R.F., 1943, GEOLOGICAL SOCIETY A, V54, P325

[1] Alden W. C., 1917, IOWA GEOLOGICAL SURV, V26, P49

[2] ALDEN WC, 1918, 106 US GEOL SURV PRO

[3] BAKER FC, 1920, U ILLINOIS B, V17

[4] BEYER SW, 1897, IOWA ACADEMY SCI P, V4, P58

[5] BLACK RF, 1959, SCIENCE, V130, P172

[6] CHAMBERLIN TC, 1897, J GEOL, V5, P795, DOI DOI 10.1086/607964

[7] CHAMBERLIN TC, 1906, GEOLOGY, V3

[8] EKBLAW GE, 1946, GEOL SOC AM BULL, V57, P1189

[9] EKBLAW GE, 1955, ILLINOIS ACAD SCI T, V47, P129

[10] Flint R.F., 1943, GEOLOGICAL SOCIETY A, V54, P325