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1 May 2007
THE UPPER PENNSYLVANIAN (MISSOURIAN) AMMONOID PENNOCERAS FROM THE NORTH AMERICAN MIDCONTINENT
DAVID M. WORK,
DARWIN R. BOARDMAN,
Royal H. Mapes
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Journal of Paleontology
Vol. 81 • No. 3
May 2007
Vol. 81 • No. 3
May 2007