BIBLIOGRAPHY OF THE DRIFTLESS AREA 
79 
Wheeler, H. A., The Wisconsin Zinc District: Mines and Minerals, 
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1907 
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1908 
Mansfield, G. R,, The Baraboo Region of Wisconsin: Jour. Geo- 
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1909 
Alden, W. C., Criteria for the Discrimination of the Age of Glacial 
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Lange, E. G., Caves of the Driftless Area of Southwestern Wiscon- 
sin, Unpublished Thesis, University of Wisconsin. 
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1910 
Clark, V. B., Geography of the Potsdam Sandstone Area in Wiscon- 
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1911 
Bowman, Isaiah (On Plants in the Driftless Area), Forest Physio- 
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Cox, G, H., The Origin of the Lead and Zinc Ores of the Upper 
Mississippi Valley District: Econ. Geology, Vol. VI, No. 5, pp. 427-448. 
