A large collection of the letters and manuscripts of Rafael de Zayas Enriquez, as well as a miscellaneous collection of letters and bills of sale pertaining to the activities of Marius de Zayas. The Rafael de Zayas Enriquez papers include letters, manuscripts, books, and clippings. His writings reflect his many and varied talents and interests: history, poetry, sociology, novels, and plays. His manuscripts and books comprise the bulk of this collection. The photocopies of letters to Marius de Zayas pertain to the magazine "291" and the Modern Gallery. There is correspondence from Pablo Picasso, Diego Rivera, Paul Guillaume, Max Jacob, Agnes Meyer, Alfred Stieglitz, Tristan Tzara, and Max Weber. The majority of these letters are unpublished although some of the most important ones appear in Michel Sanouillet's Francis Picabia et "291" (Paris, 1966).