The Curt P. Richter Collection spans his career at Johns Hopkins. It includes research data, photographs, reprints, correspondence, and equipment. The bulk of the material consists of research data based on experiments and observations of over 20,000 animals, conducted from 1920 through 1976. Data from experiments conducted on human subjects, including skin resistance and grasp reflex, comprise another major part of the collection. Formats of research data include logbooks, notebooks, charts, photographs, and slides. Other photographs in the collection depict Richter, members of his family, the laboratory staff, and equipment. There is a vast collection of reprints by Richter (arranged by subject) and by others (arranged by author). A small amount of administrative correspondence remains. The collection also contains several pieces of laboratory equipment, including animal activity cages (which Richter devised), recording and measuring devices, and photographic equipment.