Correspondence, research materials, published and unpublished manuscripts and articles, slides, photographs and one audio tape reel. The collection documents Barker's anthropological research into the social functions of language and the Pachuco language of Hispanic youths. Correspondents include Edward P. Dozier, Edward H. Spicer and Francis Gillmor. Slides depict travel scenes, including Yaqui village scenes and Holy Week processions in Hermosillo, Mexico. The collection includes photographs and negatives taken in Mexico, and various ceremonies, including a Yaqui ceremony. The sound recording contains interviews and dialect of the Pachuco language used by members of Tucson, Arizona youth gangs in the 1940s.