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Yang, Z.; Yancey, T. E. (2000). Fusulinid Biostratigraphy and Paleontology of the Middle Permian (Guadalupian) Strata of the Glass Mountains and Del Norte Mountains, West Texas. In: Guadalupian Symposium. Wardlaw, B. R., Grant, R. E., and Rohr, D. M., Eds. Smithsonian Contributions to the Earth Sciences. 32: 185-259.