The materials in this collection reflect the research of Allan R. Holmberg and others in Peru, most notably relating to the Cornell Peru Project but also including materials on the Cornell Cross-Cultural Methodology Project and Holmberg's research in Viru, Peru.

Copies of field notes compiled in Human Relations Area Files categories; typed newspaper articles about haciendas; cards comprising a Vicos census carried out in 1957-1959 by Dr. Mario C. Vázquez. Typing of notes was carried out by young women students in the Peruvian National School of Social Work, who began working for the CPP in 1960, recruited by Dr. Cara E. Richards (who was in charge of a fertility study directed by Dr. J. Mayone Stycos).

Collection contains publications, coursework, and correspondence relating to Ayers' work in Vicos, Peru and Lima, Peru under the direction of Alan Holmberg and William Whyte of Cornell University. Also includes a survey film (1982) and a video titled "So that Men are Free: Vicos."

Papers documenting his professional career, especially his work in Thailand.

Files, publications, clippings, field notes and field notebooks, photographs, and slides of Vicos and the Barriadas.