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1897 
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Leonard , A. G., Lead and Zinc Deposits of Iowa: Iowa Geo-1. Sur- 
vey, Vol. VI, pp. 9-66. 
Park, M. .8., Geology of an Area in Green County, Wisconsin, Un- 
published Thesis, University of Wisconsin. 
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cinity of Devils Lake and Baraboo, Wisconsin: Jour, of Geology, Vol. 
V, pp. 131-147. 
Sardeson, F. W., On Glacial Deposits in the Driftless Area: Am. 
Geologist, Vol. XX, pp. 392-403. 
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Geology, Vol. V, pp. 825-836. 
1898 
Buckley, E. R., On the Building and Ornamental Stones of Wis- 
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Squier, G. H., Studies in the Driftless Region of Wisconsin: Jour. 
Geology, Vol. VI, pp. 182-192. 
Upham, Warren, Time of Erosion of the Upper Mississippi, Minne- 
sota, and Saint Croix Valleys: Science, new ser., Vol. VIII, p. 470. 
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1899 
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1900 
Calvin, Samuel, A Notable Ride from Driftless Area to Iowan Drift: 
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