The bulk of the collection consists of correspondence with individuals and organizations (including letters from Ivan Bahrianyi, Ivan Kernyts’kyi and Edward Kozak), unpublished fragments of books, three articles, and a 1941 diary. The collection also includes an autobiographical note and authorization of Ivan Shkvarko as well as Sobenko’s family financial documents and an affidavit for Shkvarko’s immigration. Works by others consist of an article by I. Bibrets’kyi co-authored with Ivan Shkvarko.