As a kid, I read this book in Marathi, and later in English. Absolutely amazing to find it online! Especially all the wonderful illustrations!
See A little page of Russian Resources for more!
Now only if I could find all the other wonderful books from Mir Publishers, Moscow. Especially the science books! Ya Perelman's books on Physics and Mathematics.. and the wonderful stories of the discovery of each element in the Chemistry texts!
This is another reason why Free Culture is so important. Amidst the massive changes around the globe, little treasures like these books are easy to lose. Relaxing copyright control, and allowing digital archives might help save these.