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200 1 $a<<A >>study of the Middle Devonian widder formation of Southwestern Ontario$fJean D. Wright, Edward P. Wright
210   $aAnn Arbor$cMuseum of Paleontology-The University of Michigan$d1961
215   $a17 p.$d23 cm
610 0 $aPaleontologia
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701  1$aWright,$bEdward P.$076662
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