Whitfield R.P. (1878). Preliminary descriptions of new species of fossils from the lower geological formations of Wisconsin. <em>Annual report of the Wisconsin Geological Survey for 1877.</em> 50-77.[details]
original descriptionWhitfield R.P. (1878). Preliminary descriptions of new species of fossils from the lower geological formations of Wisconsin. <em>Annual report of the Wisconsin Geological Survey for 1877.</em> 50-77.[details]
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