This has been done before by others, but this one is for me. I don't want to forget. Will keep revisiting and updating the list as I remember more books.
Nikolai Nosov:
The Adventures of Dunno and his friendsAlexander Raskin: When Daddy was a little boy
Vladislav Krapivin: August, the month of winds
Valery Medvedev: Barankin, be a Man!
Victor Dragunsky: The Adventures of Dennis
Alexander Volkov: Oz (I actually like this one and the sequels more than the Baum's original)
[EDIT: November 11, 2009, 14:38]
Nikolai Nosov: Schoolboys
[END EDIT]
Non-fiction
Yakov I. Perelman: Mathematics can be fun, Physics can be fun (and the mixed edition Mathematics and Physics can be fun) (Wikipedia informs me that Perelman died of starvation during the Siege of Leningrad in 1942.)
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[EDIT: November 11, 2009, 14:38]
There was this book which had been translated into Assamese as "Siskin moi aru bohutu" (Literally 'Siskin, I and many others'). I don't remember the title in English. (My Googling effort suggests that it could have been Kolya Sinitsyn's Diary, but I don't quite think so.) Found the book. It was 'Schoolboys', by Nikolai Nosov, who incidentally also wrote 'Kolya Sinitsyn's Diary.
[END EDIT]
Don't remember any other good ones.
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A lot of these books were quite political with mentions of the 'Young Pioneer', about happy life in Collective Farms, and full of patriotic stories. But they were cheap - Rs. 10 or less, and when I was in my early teens, I would take a bus to the next town for the book fair, and buy tons of books from Russian publishers (Progress, Raduga, Mir, Vostok, and the rest), and the government run Indian Children Books publishers created in the Russian image (National Book Trust and Children's Book Trust).
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And then there was the magazine: Misha
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[Edit: November 23, 2009, 18:21]
Misha!