| Letter, A. I. Maltsev->A.P. Ershov, 29.12.1962 Request to read the work submitted to the All-Union contest of students’ works in mathematics.
Telegram, N.M. Sotsky->A.P. Ershov, 15.12.1962Request to phone to Moscow.
Information letter, 15.12.1962about the symposium “The Principles of Self-Learning Systems Construction” and an offer to participate in it.
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