Information, 21.08.1978
Letter, N. P. Trifonov->A.P. Ershov, 04.06.1978
Letter (hand-written), Ya. M. Barzdin->A.P. Ershov, 07.09.1978Thanks for the book "Introduction to theoretical programming"; wants to present his books on PL/1 and OS ES
Letter, I. S. Ladenko->A.P. Ershov, 19.10.1978
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