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https://iro.uiowa.edu/esploro/outputs/doctoral/Permian-goniatitid-ammonoids-family-paragastrioceratidae/9985152850702771 Permian goniatitid ammonoids: family paragastrioceratidae - University of Iowa Permian goniatitid ammonoids: family paragastrioceratidae - University of Iowa - Dissertation university ofpermianammonoidsfamilyiowa https://iro.uiowa.edu/esploro/outputs/doctoral/Upper-Mississippian-Chesteran-ammonoids-from-the/9985152815602771 Upper Mississippian (Chesteran) ammonoids from the Pitkin formation in Arkansas - University of Iowa Upper Mississippian (Chesteran) ammonoids from the Pitkin formation in Arkansas - University of Iowa - Dissertation https://iro.uiowa.edu/esploro/outputs/doctoral/Pennsylvanian-ammonoids-from-Ellesmere-Island-Canadian/9985152227602771 Pennsylvanian ammonoids from Ellesmere Island, Canadian Arctic Archipelago - University of Iowa Pennsylvanian ammonoids from Ellesmere Island, Canadian Arctic Archipelago - University of Iowa - Dissertation ellesmere islandcanadian arcticuniversity ofpennsylvanianammonoids https://iro.uiowa.edu/esploro/outputs/doctoral/Upper-Mississippian-Chesterian-Ammonoids-from-the/9985152592702771 Upper Mississippian (Chesterian) Ammonoids from the Imo and Rhoda Creek formations, Arkansas and... Upper Mississippian (Chesterian) Ammonoids from the Imo and Rhoda Creek formations, Arkansas and Oklahoma - University of Iowa - Dissertation from the