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The original southern limit of the Pennsylvania anthracite beds. 
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Geology of Cherokee and Buena Vista counties, with notes on 
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Submerged valleys in Sandusky bay. (Nat. Geog. Mag., vol. 13, 
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Report on Artesian wells, 1901. (Iowa Geol. Sur., vol. 12, pp. 
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Geology of Heni-y county. (Iowa Geol. Sur., 1901, vol. 12, pp. 
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The loess of Natchez, Miss. (Am. Geol., vol. 30, Nov. 1902, pp. 
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