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Ordovician Fossils from Wells in the Williston Basin, Eastern Montana: Usgs Bulletin 1021-M
List Price $17.75
Ordovician Graptolites of the Basin Ranges in California, Nevada, Utah, and Idaho: Usgs Bulletin 1134
List Price $25.75
Ordovician Brachiopods, Trilobites, and Stratigraphy in Eastern and Central Nevada: Usgs Professional Paper 639
List Price $21.75