Kammala jumla mai zuwa: Babban aikinsa na ƙarshe, "Historia Polski 1914 <unk> 1939" ("Tarihin Poland 1914-1939"), an buga shi bayan mutuwarsa. Sakamakon murkushewar gwamnati a kan 'yan adawa an yi wa littafin takunkumi sosai, amma ba da daɗewa ba an fahimci ɓoyewar ɓoye a cikin "bibuła" (Rasha "samizdat"). Tsinkayar littattafansa misali ne mai kyau na matsalar da masana tarihi ke fuskanta a karkashin gwamnatocin da ke tsoma baki cikin aikin ilimi. Musamman ma, 'yan gurguzu na' yan gurguzu na Poland sun cire duk wani ambaton yarjejeniyar Molotov-Ribbentrop (Jamus ta Nazi-Soviet) da kuma sashin da Soviet ta mamaye Poland a ranar 17 ga Satumba 1939 tare da hoton da aka yi a ranar 17 ga Satumba 1939.
An cire fareti na soja na Jamus da Soviet a Brest-Litovsk kuma an maye gurbinsa da bayanin kula na gaba ɗaya game da iyakokin da aka canza.