Letter, A.N. Bogolyubov->A.P. Ershov, 07.05.1980
Covering letter (hand-written), G. E.Tseitlin ->A.P. Ershov, 16.05.1980
Letter (hand-written), G. E.Tseitlin ->A.P. Ershov, 10.06.1980
Covering letter (hand-written), G. E.Tseitlin ->A.P. Ershov, 04.07.1980
Letter, A. N. Terekhov->A.P. Ershov, 11.06.1980
Letter, Unknown Author->A.P. Ershov, 25.06.1980
Telegram, Lipetsky->A.P. Ershov, 16.07.1980
Information letter, H. Khinov->A.P. Ershov, 04.08.1980
Covering letter, V. P. Tikhomirov->A.P. Ershov, 15.07.1980
Letter (hand-written), A. G. Kushnirenko->A.P. Ershov, 26.08.1980
Letter, R.R. Khomskis->A.P. Ershov, 05.09.1980
Covering letter (hand-written), Unknown Author->A.P. Ershov, 25.09.1980
Covering letter (hand-written), Unknown Author->A.P. Ershov, 16.10.1980
Letter, A. M. Bogomolov->Unknown addressee, 17.09.1980
Letter, A. M. Bogomolov->A.P. Ershov, 17.09.1980
Letter, I. I. Malashinin->A.P. Ershov, 02.10.1980
Covering letter, T.V. Ryabushkin->A.P. Ershov, 08.10.1980
Letter (hand-written), D. N. Todoroi->A.P. Ershov, 27.10.1980While grape-picking in Moldavia, the author spends his spare time on polishing his dissertation; being afraid not to finish it in time, he asks to postpone the meeting till the end of November
Covering letter, G. E.Tseitlin ->A.P. Ershov, 04.11.1980
Phoned telegram, Yu. Ya. Bazelevsky->A. S. Alekseev, 06.11.1980
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