Geological and Natural History Survey of Minnesota 
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Res ation! 
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IES 
GEOLOGICAL 
AND 
NATURAL HISTORY SURVEY 
OF 
MINNESOTA. 
N-HWINCHELL, STATE GEOLOGIST. 
Scale: 42 miles to an inch. 
fa Probable Cretaceous Areas 
fea] Lower Silurian Areas 
yLa Crosse 
JULIUS BIEN B ¢ 
