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).

Photographs documenting the Vicos hacienda in the Callejon de Huaylas, Ancash, Peru. Photographers include Henry F. Dobyns, Mario C. Vázquez, William Mangin, John Collier, Paul Doughty and Abraham Guillén. Also, cards providing Human Relations Area File (HRAF) numbers for the photographs.