The collection consists of manuscripts, writings, correspondence (both personal and professional), photographs, works of others, microfilm, printed material, and film reels, spanning more than 50 years, concerning Velikovsky's controversial ideas, the books that he wrote, and the history of opposition and criticism from the academic community that he received following the publication of his first book, Worlds in Collision, in 1950. the collection includes records of his collavorations with Albert Einstein and Sigmund Freud.