1. Trilobites of the late Cambrian Pterocephaliid biomere in the Great Basin, United States Author/Creator: Palmer, Allison R. Publication/Creation: Washington : U.S. Govt. Print. Off, 1965 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 492-494. Access & Availability: Loading
2. Trilobites of the late Cambrian Pterocephaliid biomere in the Great Basin, United States Author/Creator: Palmer, Allison R., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1965 Resource Type: Book Access & Availability: Loading
3. Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada Author/Creator: Pratt, Brian R. Publication/Creation: Calgary, Alta. : Canadian Society of Petroleum Geologists, 1992. St. John's, Nfld. : Geological Association of Canada, 1992 Resource Type: Book Access & Availability: Loading
4. Trilobites of the Upper Cambrian Dunderberg shale, Eureka District, Nevada Author/Creator: Palmer, Allison R., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1960 Resource Type: Book Access & Availability: Loading
5. Trilobites of the Upper Cambrian Dunderberg shale, Eureka District, Nevada, Author/Creator: Palmer, Allison R. Publication/Creation: Washington : U.S. Govt. Print. Off, 1960 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 334-337. Access & Availability: Loading
6. Trilobites of the Upper Cambrian Sunwaptan Stage, southern Canadian Rocky Mountains, Alberta Author/Creator: Westrop, S. R. Publication/Creation: Calgary, Alta. : Canadian Society of Petroleum Geologists, 1986. Toronto, Ont. : Geological Association of Canada, 1986 Resource Type: Book Access & Availability: Loading