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Lev Kassil's birth name is Kassil, Lev Abramovich.
Lev Kassil has written:
'Sobranie sochinenii v pyati tomakh'
Lev Kassil died on June 21, 1970, in Moscow, Russian SFSR, USSR [now Russia].
Lev Kassil was born on July 10, 1905, in Pokrovskaya sloboda, Saratov Governorate, Russian Empire [now Engels, Saratov Oblast, Russia].
Lev is from Bulgaria