If you’re looking for these specific verification and control works ( ПроверочныеП р о в е р о ч н ы е контрольныек о н т р о л ь н ы е работыр а б о т ы ), here’s the modern way to find them:
Fast forward to today: that same link will likely lead to a "404 Not Found" or a parked domain page. The "Variant 2" book by (often part of the "School 2100" curriculum) has since moved from the wild west of file-sharing to official digital libraries and bookstores. Where the Files Live Now If you’re looking for these specific verification and
Sites like the Russian State Library (NEB) often have these listed for academic reference. Most teachers have moved these files to Google
Most teachers have moved these files to Google Drive or Yandex Disk , which are much safer and faster than the old Letitbit days. Why the Shift? Here is a story of how that search
You can still find physical or licensed digital copies of the Buneev 4th Grade set (Part 1 and Part 2) at specialized stores like SBooks or Shkola 2100 outlets.
Here is a story of how that search usually goes down and where those 4th-grade materials actually are: The "Dead Link" Quest