The Brewster Family Papers contains financial documents, photographic materials, literary productions, and legal documents. All the items are associated with ranching operations of the Brewster family. The material pertains to the operation of the Brewster Arnold Ranch Company, Quarter Circle U Ranch, X Diamond Bar Cattle Company, and Lyman Brewster and his activities in livestock organizations and political appointments. Some topics of interest are brucellosis and foot-and-mouth diseases, over 50 years of ranch accounts, efforts to change the federal brand inspection law during the 1950s, and price analysis of sale cattle from 1912 to 1962.
The Joseph T. Brown papers consist of a photocopied financial account record book which lists expenses both chronologically and by account name, 1887-1894. Included are notations about goods purchased, payroll expenses for hired hands, and cattle sales. The record book is supplemented with a few original cattle sale receipts, and a photocopied lease agreement for grazing rights on the Northern Cheyenne Indian reservation in southeast Montana.