Grigoryeva Maria V. Country: RussiaCity: SaratovCompany: State Museum of K. A. Fedin, 154 Chernyschevskogo St., Saratov 410002, Russia Position: Deputy Director for ResearchE-mail: maria.grig2010@yandex.ru Author's articles E. G. Polonskaya and K. A. Fedin: To the history of the relationship