Aha! I see what you are doing. Trying to appeal to all the librarians we have on here (there are quite a few!) by mentioning the
Society for the Scientific Study of Reading.
Don't worry, I'm jesting with you. I know you were being your meticulous self, and transliterating "СССР" into Latin characters.
And, yes, I did go to the bother of switching to the on-screen Cyrillic keyboard to type those letters rather than just use the Latin letters that look like them. If you can be meticulous, so can I!
CaroLiza_fan