Typescript memoirs, in two volumes, of Tkachenko. The memoirs are written under the pseudonym St. Chemer, and are entitled: "Dvadt︠s︡at ́pi︠a︡t ́let pod serpom i molotom" (429 p.), and "Dva lata pod znakom svastiki" (76 p.). There are also clippings of three memoiristic articles by Tkachenko.

Manuscript memoirs (207 p.) that describe Bernard's experiences in the Soviet Ukraine between the Wars and the Second World War in the Vinnytsia area.