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1 May 2007 THE UPPER PENNSYLVANIAN (MISSOURIAN) AMMONOID PENNOCERAS FROM THE NORTH AMERICAN MIDCONTINENT
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DAVID M. WORK, DARWIN R. BOARDMAN, and Royal H. Mapes "THE UPPER PENNSYLVANIAN (MISSOURIAN) AMMONOID PENNOCERAS FROM THE NORTH AMERICAN MIDCONTINENT," Journal of Paleontology 81(3), (1 May 2007). https://doi.org/10.1666/05094.1
Accepted: 1 January 2006; Published: 1 May 2007
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