. "Russian language--Grammar" . . "643388241" . . . "1961" . . "3rd ed." . . . "ru" . . "643388241" . . . . "Russian : elementary course. Book 1" . . . . . "Foreign Languages Pub. House" . . "Uchebnik Russkogo iazyka." . . "Potapova" . "Nina Filippovna" . "Nina Filippovna Potapova" . . . . "2018-03-11" . . . "ru" . . . . "1961" . . . "Russian language--Grammar" . . "Moscow" .