The subseries Correspondence, 1966-1990 (4.75 linear feet), the first of two correspondence files, includes Parsons' incoming and outgoing correspondence during the first decades of his professional career. The time period for the materials starts in the late 1960s while Parsons was completing his Ph.D. at the same time as teaching at the University of Michigan and doing field research in the Basin of Mexico. It goes on to document Parsons' field work in other regions in Mexico, Peru, and Iceland as well as his work with the University of Michigan Museum of Anthropology and as a professor in Peru, Mexico, and Michigan.
The subseries is comprised mostly of letters, telegrams, research proposal materials, some postcards and greeting cards among other formats. Materials include correspondence related to his courses, research publications, and professional associations. Correspondence includes communications with mentors, students, fellow archaeologists and anthropologists, renowned figures in the field, the University of Michigan Museum of Anthropology, the College of Literature, Science and Arts, international collaborators and institutions. Some correspondents include: Elizabeth Brumfield, Terence D'Altroy, Larry Gorenflo, James B. Griffin, Charles Hastings, Mary Hodge, Darell LaLone, Ramiro Matos Mendieta, Thomas McGovern, Elinor Melville, Timothy Earle, Deborah Nichols, Lorenzo Roselló Truel, Norbert Ptusy, William T. Sanders, and Mari Carmen Serra.
Materials for the subseries were received directly from Parsons. Among these, two distinct groupings are discernible. This is reflected in the arrangement where sometimes two or more folders for the same letter will be present. Materials are arranged alphabetically and include miscellaneous folders by letter as well as named folders for frequent correspondents.