Tilton, G. R.; Wetherill, G. W.; Davis, G. L. (1962). "Mineral Ages from the Wichita and Arbuckle Mountains, Oklahoma, and the St. Francis Mountains, Missouri". Journal of Geophysical Research. 67 (10): 4011. Bibcode:1962JGR....67.4011T. doi:10.1029/jz067i010p04011.
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Tilton, G. R.; Wetherill, G. W.; Davis, G. L. (1962). "Mineral Ages from the Wichita and Arbuckle Mountains, Oklahoma, and the St. Francis Mountains, Missouri". Journal of Geophysical Research. 67 (10): 4011. Bibcode:1962JGR....67.4011T. doi:10.1029/jz067i010p04011.