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First report of a geological reconnoissance of the northern counties of Arkansas, made during the years 1857 and 1858 /
By: Arkansas Geological Survey. - Cox, E. T. - Elderhorst, William. - Owen, David Dale,
Publication info: Little Rock,Johnson & Yerkes, state printers,1858.
Contributed by: Cornell University Library
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The Palæontological report : as prepared for the Geological report of Kentucky and published in vol. 3 /
By: Cox, E. T. - Lesquereux, Leo, - Lyon, Sidney Smith,
Publication info: Frankfort, Ky. :A.G. Hodges,1857.
Contributed by: Cornell University Library
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