The Adolph Oko collection of Spinoza materials contains correspondence surrounding the Domus Spinoza and Spinoza-related findings. Also included are Oko's personal notes on Spinoza, his collected Spinoza ephemera, and Spinoza-related clippings, as well as some of Oko's personal photographs, primarily of himself and Dr. Carl Gebhardt. It also contains the card files belonging to Oko, Gebhardt, and the Spinoza Bibliography.