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Samuel Calvin

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Iowa Geological Survey Annual Report, 1906, with Accompanying Papers, Volume 17
Iowa Geological Survey Annual Report, 1906, with Accompanying Papers, Volume 17
Iowa Geological Survey, Vol. 10 Annual Report, 1899, with Accompanying Papers (Classic Reprint)
The American Geologist, Vol. 9 A Monthly Journal of Geology and Allied Sciences; January to June, 1892 (Classic Reprint)
Iowa Geological Survey, Vol. 7 Annual Report, 1896, with Accompanying Papers (Classic Reprint)
The American Geologist, Vol. 12 A Monthly Journal of Geology and Allied Sciences; July to December, 1893 (Classic Reprint)
Iowa Geological Survey, Vol. 17 Annual Report, 1906 with Accompanying Papers (Classic Reprint)
Iowa Geological Survey, Vol. 6 Report on Lead, Zinc, Artesian Wells, Etc (Classic Reprint)
Iowa Geological Survey, Vol. 8 Annual Report, 1897, with Accompanying Papers (Classic Reprint)