Already have a thread for the Polish MiG-21PFM #6913 and rather to clog that that one up, I'll start this one...for everything MiG-21!
So far, I've got three MiG-21's in 1/48, thinking of getting another couple or so, for the biggest users, or most likely any those of the Warsaw Pact...
Made available for download by George Washington University National Security Archive, the US evaluation of the former-Iraqi MiG-21 that defected to Israel in 1966 (22 MB pdf):
http://theaviationist.com/wp-content/uploads/2013/11/havedoughnut.pdf