This guide, which documents the first phase of a continuing program to strengthen and develop Mexican American materials and research sources at the University of Texas at Austin, lists and describes both textual and non-textual materials in the collections of literary manuscripts, organizational archives, and personal papers. The first section includes manuscripts and papers of eight authors: Alurista (pseudonym for Alberto Baltazar Urista), Juan Bruce-Novoa, Abelardo B. Delgado, Roland R. Hinojosa-Smith, Jovita Gonzalez Mireles, Ricardo Sanchez, Mary Carman Tafolla, and Estela Portillo Trambley. The collections of Carlos Villalongin Dramatic Company, Economy Furniture Company Strike, League of United Latin American Citizens (LULAC), Raza Unida Party, and Texas Farmworkers Union comprise the organizational archives section. The personal papers section contains the collections of Lalo Astol, Carlos Eduardo Castaneda, Eleuterio Escobar, Catarino E. Garza, Leo John Leo, the Migrant Border Ballad Project, Edmundo E. Mireles, Romulo Munguia, Manuel Ramirez, George Isidore Sanchez, and the Tafolla Family. Each entry includes the Benson Collection call number, a physical contents description, historical background information, and in some cases, an inventory and sources used to compile the collection. Such nonprint materials as photographs, slides, and audiotapes are included, and an index to the guide is provided. (RBF)