This Russian language textbook for 4th grade by M. L. Zakozhurnikova and N. S. Rozhdestvensky is a natural continuation of the classic series by Kostin for 1st-2nd grades (1953 edition). It remains an excellent resource for teaching and learning Russian, suitable for both modern classrooms and self-study. Many students continue to learn from this textbook today due to its clear explanations and effective teaching methods.
