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Dunbar, C. O. (1924). Kansas Permian insects. Part 1. The geologic occurrence of the environment of the insects. American Journal of Science, fifth series. 7(39): 171-208.
Dunbar, C. O. (1924). Kansas Permian insects. Part 1. The geologic occurrence of the environment of the insects. American Journal of Science, fifth series. 7(39): 171-208.
