74 
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1892 
Hall, C. TV., and Sardeson, F. TV., Paleozoic Formations of South- 
eastern Minnesota: Bull. Oeol. Soc. America, Vol. 3, pp. 331-368. 
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1893 
Blake, TV. P., The Progress of Geological Surveys in the State of 
Wisconsin — A Review and Bibliography: Trans. Wisconsin Acad. Sci., 
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Blake, TV. P., The Mineral Deposits of Southwest Wisconsin: Am. 
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Gilbert, G. K., (On the Driftless Area), Congres Geologique Inter- 
national, pp. 289-290, Washington; See also S. F. Emmons, Ibid., pp. 
298-301. 
Jenney, TV. P., Lead and Zinc Deposits in the Mississippi Valley: 
Trans. Am. Inst. Min. Eng., Vol. XXII, author’s separate, pp. 6, 11, 38, 
et seq. 
Norton, TV. H., Thickness of the Paleozoic Strata of Northeastern 
Iowa: Iowa Geol. Survey, Vol. Ill, pp. 176-186. 
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Mississippi Valley and the Origin of the Ores; Jour. Geology, Vol. 1, 
pp. 612-619. 
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Paper of Prof. Posepny: Trans. Am. Inst. Min. Eng., Vol. XXIII, pp. 
588-589. 
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1894 
Blake, W. P., Wisconsin Lead and Zinc Deposits: Bull. Geol. Soc. 
America, Vol. 5, pp. 25-32. 
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Trans. Am. Inst. Min. Eng., Vol. XXII, pp. 558-568; also Am. Geologist, 
Vol. XII, pp. 237-248. 
Blake, TV. P., Discussion on Lead and Zinc Deposits of the Mississ- 
ippi Valley: Trans. Am. Inst. Min. Eng., Vol. XXII, pp. 621-634. 
Blake, IV. P., Discussion on Genesis of Ore Deposits: Trans. Am 
Inst. Min. Eng., Vol. XXIII, p. 587. 
Chamberlin, T. C., Discussion on Wisconsin Lead and Zinc Deposits: 
Bull. Geol. Soc. America, Vol. 5, p. 32. 
Jenney, TV. P., Lead and Zinc Deposits of the Mississippi Valley: 
Trans, Am. Inst. Min. Eng., Vol. XXII, pp. 171-225, 642-646. 
Leonard, A. G., Occurrence of Zinc in Northeastern Iowa: Proc. 
Iowa Acad. Sci., Vol. I, Part IV, pp. 48-52. 
