This subseries mainly contains sale catalogs, Santa Gertrudis cattle breeding information, pedigrees, sales receipts, some correspondence, advertising tear sheets, and photographs of bulls, accompanied by many clippings regarding the Nine Bar Ranch in Cypress, Texas owned by Sterling C. Evans and Gus Wortham. This was the first major ranching and marketing venture by the two partners. Also present are correspondence and sales materials concerning cattle sales to Russian buyers. Though only in existence for about twenty years, Nine Bar Ranch's history of operations represents pacesetting marketing strategies still emulated by a multitude of modern cattle and horse ranches.

This subseries contains mostly correspondence and articles, with some photographs, illustrating Evans' involvement as a benefactor of the Texas A&M University Libraries, and the high level of esteem in which he was held by administrators, faculty, and staff within the library. Evans' patronage had a profound effect on elevating the status of Sterling C. Evans Library to that of a nationally ranked research institution.

This subseries is composed predominantly of financial documents, advertising and promotional materials for cattle sales, photographs of ranch home interiors and exteriors, and correspondence surrounding the ownership and operation of three large ranches in Texas and New Mexico. Also present are several plat maps and blueprints housed separately as oversized items. Files are arranged first by type, with correspondence, then general financial and legal files, followed by a group of financial and legal subject files arranged alphabetically by topic, and finally files of photographs and clippings, followed by oversized maps and blueprints.