The Dr. Richard Caplan Sherlock Holmes Collection consists of publications, ephemera, and a variety of artifacts collected throughout Caplan's lifetime as an avid Sherlock Holmes enthusiast. Some materials included in the collection are club journals and magazines, convention stationery, board games, magnifying glasses, smoking pipes, deerstalker hats, and an umbrella and cane, both with a sculpture of Sherlock Holmes for the handles.

British writer and philosopher. Manuscripts for most of her novels, plays, and poetry, primarily handwritten drafts in notebooks.