Also a letter from Thomas W. Voetter, American Consul, American Consulate, Guaymas, Mexico, to the Secretary of State in the U. S. regarding the ruins. Guaymas, Mexico, June 1, 1932. Typescript carbon copy letter. 2 pages and brief notes by Stirling and Judd, June 11, 1932 and June 14, 1932. Autograph document signed.
NAA MS 3321
Annotations in ink on back of the two petroglyph photos say, "Yaqui River, Sonora, Mex. see letter Guillermo Revilla" and "Yaqui River Sonora. Guillermo Revilla." It was not known in 1969 who Guillermo Revilla was.