Contains photocopies and a notebook of Christian-related texts from Gates' collection of texts in the Tzeltal language.

Contains photocopies and typescripts of Christian-related texts from Gates' collecton of texts in the Tzotzil language.

Contains photocopies of Christian-related texts from Gates' collection of texts in the Tzutuhil language.

Contains photocopies and a typescript of unidentified texts from Gates' collection of texts in native languages.

Contains photocopies and a typescript of Christian-related texts from Gates' collection of texts in the Zapotec language.

Contains photocopies of Christian texts from Gates' collection of texts in the Zoque language.

Contains photocopies, typescripts, and manuscripts from Gates' collection of ethnohistorical materials in European languages, primarily Spanish with some German and English texts.

Contains writings related to Gates' institutional affiliations with the Aryan Theosophical Society, the San Diego Museum, and the Department of Middle American Research at Tulane University. While his work with the Department of Middle American Research at Tulane University was directly related to the study of Mesoamerica, Gates' affiliations with the Aryan Theosophical Society and the San Diego Museum were not related to the study of Mesoamerica.

Contains notes, reports, and other materials related to Gates' work with the Department of Middle American Research at Tulane University. Includes information on the history and archaeology of Guatemala, as well as to the contemporary situation in the region. Most prevalent are documents relating to Tulane's 1925 agricultural survey of the Southern Mexican state of Tabasco. Materials date from between approximately 1920 and 1926.

Contains the San Diego Museum's articles of incorporation, a multiple page, typed membership list, five bulletins/announcements from 1917 to 1930, an announcement appealing for members of the museum, and Gates' life membership card for the museum.