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*Frye, J. C., and Leonard, A. B. (1957) Studies of Cenozoic geology along eastern margin of Texas High Plains, Armstrong to Howard counties: Univ. Texas, Bur. Econ. Geol. Rept. Inves. No. 32, 62 pp.

*——, and —— (1959) Correlation of the Ogallala Formation (Neogene) in western Texas with type localities in Nebraska: Univ. Texas, Bur. Econ. Geol. Rept. Inves. No. 39, 46 pp.

*——, and —— (1964) Relation of Ogallala Formation to the southern High Plains in Texas: Univ. Texas, Bur. Econ. Geol. Rept. Inves. No. 51, 25 pp.

*Girard, R. M. (1959) Bibliography and index of Texas geology: Univ. Texas Pub. 5910, 238 pp.

*—— (1964) Texas rocks and minerals: Univ. Texas, Bur. Econ. Geol. Guidebook No. 6, 109 pp.

Gould, C. N. (1902) The geology and water resources of the eastern portion of the Panhandle of Texas: U. S. Geol. Survey Water-Supply Paper 154, 64 pp.

—— (1907) The geology and water resources of the western portion of the Panhandle of Texas: U. S. Geol. Survey Water-Supply Paper 191, 70 pp.

*Matthews, W. H., III (1960) Texas fossils: An amateur collector’s handbook: Univ. Texas, Bur. Econ. Geol. Guidebook No. 2, 123 pp.

*Patton, L. T. (1923) The geology of Potter County [Texas]: Univ. Texas Bull. 2330, 180 pp.