The Robert Mearns Yerkes papers (1822-1985) are available for research. This collection includes correspondence and other materials on chimpanzee and gorilla behavior among other topics. For a detailed description of the collection see its Guide (link at http://hdl.handle.net/10079/bibid/4283306). The materials in this collection can be paged through Orbis from the Library Shelving Facility for use in Sterling Memorial Library Manuscripts and Archives. Call number MS 569.