Papers of Robert Thomson Leiper, [1880-1960] contain material concerning an expedition by Leiper to British Guiana and the West Indies; a commission from the London School of Tropical Medicine to study filariasis and material relating to Leiper, his work at the School and his family including photographs, postcards from West Africa, autograph book, reports as an helminthologist, material on the Peking Union Medical College and family history research.