1. Early Pennsylvanian ammonoids from southern Nevada Author/Creator: Gordon, Mackenzie, 1913- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1969 Resource Type: Book Access & Availability: Loading
2. Early Pennsylvanian ammonoids from southern Nevada Author/Creator: Gordon, Mackenzie, 1913- Publication/Creation: Washington : U.S. Govt. Print. Off, 1969 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 611-614. Access & Availability: Loading
3. An early Reticuloceras Zone fauna from the Hale Formation in northwestern Arkansas Author/Creator: Gordon, Mackenzie, 1913- Publication/Creation: Washington : U.S. Govt. Print. Off, 1968 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 611-614. Access & Availability: Loading
4. An early Reticuloceras Zone fauna from the Hale Formation in northwestern Arkansas Author/Creator: Gordon, Mackenzie, 1913- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1968 Resource Type: Book Access & Availability: Loading