Liliana Pereyra's pelvis, about 1985. Between 1976 and 1983, Argentina's military regime committed massive human rights violations. Nearly 20,000 men, women and children were "disappeared" (los desaparecidos), abducted, tortured, raped, and murdered, with no information provided on their whereabouts. In 1984, anthropologist Clyde Snow recruited a group of Argentinean university students who lacked training in forensics, but were eager to learn. Together, they excavated hundreds of clandestine mass graves. "(We) found no fetal bones with the skeleton... But we did find pitting on the pre-auricular sulcus (groove on the sacroiliac joint) that told us that she had given birth... to a healthy baby... after which she was never seen again." Clyde Snow.