The digital images of the personal document collection of Rıza Tevfik Bölükbaşı, known by the nickname 'Feylesof' and a famous poet, philosopher, and politician of the Second Constitutional Era of the Late Ottoman Empire, which was transferred to the İSAM Library in 2016, are now accessible online.

Rıza Tevfik, a notable figure in the political and literary life of the late Ottoman period and who lived many years abroad during the Republic period, has a personal archive consisting of 3,998 documents (12,798 pages) organized into 922 separate files. This collection primarily includes letters, along with drafts of his works, photographs, and newspaper clippings.

The letters, which form an important part of the archive, include correspondence written by Rıza Tevfik himself, as well as communications with his family, local and foreign friends, and various institutions. His correspondence from his time as a deputy and minister reflects the political events of that era. The international correspondence reveals the breadth of his associations. Another significant component of the archive, the drafts of his works, predominantly contain texts written in the fields of philosophy, art, and literature.