The LITFACT publishing house issued a book:

Vladimir Nabokov. Correspondence with Mikhail Karpovich. Ed. by Andrey Babikov. Moscow: Litfakt, 2018. Series "Biblioteka Litnasledstva".

The correspondence of Vladimir Nabokov (1899-1977) with Mikhail Karpovich (1988-1959), which continued for over a quarter of a century, details the little-studied initial stage of Nabokov's literary and academic career in America after he left Europe in May 1940.