*Lee, Wallace, et al. (1939) Stratigraphic and paleontologic studies of the Pennsylvanian and Permian rocks of north-central Texas: Univ. Texas Pub. 3801. Contains an extensive faunal list and important collecting localities for Pennsylvanian invertebrates. *Moore, R. C., and Jeffords, R. M. (1944) Description of lower Pennsylvanian corals from Texas and adjacent states: Univ. Texas Pub. 4401, pp. 77-208. Describes and illustrates many of the more common Pennsylvanian corals. *Plummer, F. B. (1943) The Carboniferous rocks of the Llano region of central Texas: Univ. Texas Pub. 4329. Contains geologic map, locality data, and illustrations of many Carboniferous fossils. *Plummer, F. B., and Moore, R. C. (1921) Stratigraphy of the Pennsylvanian formations of north-central Texas: Univ. Texas Bull. 2132. Describes and illustrates many of the more common Pennsylvanian fossils of north-central Texas. *Plummer, F. B., and Scott, Gayle (1937) Upper Paleozoic ammonites in Texas: Univ. Texas Bull. 3701, pt. 1. *Renick, B. C., and Stenzel, H. B. (1931) The lower Claiborne of the Brazos River, Texas: Univ. Texas Bull. 3101, pp. 73-108. Contains discussion and illustrations of many common Tertiary fossils. Sellards, E. H. (1955) Texas through 250 million years: Museum Notes No. 4, Texas Memorial Museum, Austin. This little booklet provides a short geologic history of Texas along with a review of oil in Texas. *Sellards, E. H., Adkins, W. S., and Plummer, F. B. (1933) The geology of Texas, Vol. I, Stratigraphy: Univ. Texas Bull. 3232 (August 22, 1932). This important publication will give the advanced collector much valuable information on the distribution of the rocks of Texas. Complete with geologic map. Stanton, T. W. (1947) Studies of some Comanche pelecypods and gastropods: U. S. Geological Survey Prof. Paper 211, Washington, D. C. Describes and illustrates most of the more common Lower Cretaceous pelecypods and gastropods of the State. *Stenzel, H. B., Krause, E. K., and Twining, J. T. (1957) Pelecypoda from the type locality of the Stone City beds (Eocene) of Texas: Univ. Texas Pub. 5704. Descriptions and illustrations of many of the more common Tertiary clams and oysters. *Stephenson, L. W. (1941) The larger invertebrate fossils of the Navarro group of Texas: Univ. Texas Pub. 4101. Contains descriptions of many common Upper Cretaceous invertebrates (exclusive of corals and crustaceans). Stephenson, L. W. (1952) Larger invertebrate fossils of the Woodbine formation (Cenomanian) of Texas: U. S. Geological Survey Prof. Paper 242, Washington, D. C. *Winton, W. M. (1925) The geology of Denton County: Univ. Texas Bull. 2544. Illustrates and discusses the occurrence of many Cretaceous fossils. *Winton, W. M., and Adkins, W. S. (1920) The geology of Tarrant County: Univ. Texas Bull. 1931. Contains many illustrations of common north Texas Cretaceous fossils.