Correspondence, manuscripts, documents, photographs, subject files and printed material of Russian émigré writer, journalist, and Kadet Party leader Ariadna Vladimirovna Tyrkova-Williams. The collection also contains material by her husband, Harold Williams, and her son, Arkadiĭ Borman.

Petr Pilśkiĭ's manuscripts include articles which are primarily essays on individual Russian writers of the late 19th and early 20th century, such as Belyĭ, Belinskiĭ, Bunin, Chekhov, Saltykov-Shchedrin etc. These manuscripts, most likely prepared initially to serve as introductions to publications of single or collected works, are typed carbons, apparently copied considerably later. The manuscripts of E.S. Pilśkai︠a︡ are chiefly memoirs, including recollections about her studies at the Imperial Theater School (Imperatorskoe Teatralńoe Uchilishche) in St. Petersburg, theater life in Russia, her stay in Odessa and Kiev during 1918-1919 and about the Soviet takeover of Latvia in 1940. Included in the collection are several articles about Pilśkiĭ by his wife and by A. Kuprin and A. Amfiteatrov.