Jacksonville Public Library
2
Resources share the relationship
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Obradovich, John D
Biostratigraphic data from Upper Cretaceous formations--eastern Wyoming, central Colorado, and northeastern New Mexico, by E.A. Merewether, W.A. Cobban, and J.D. Obradovich
Eocene rocks in northeast Washington--radiometric ages and correlation, the genetic relations among numerous patches of volcanic rocks, by R.C. Pearson and J.D. Obradovich