Covering letter, Unknown Author->A.P. Ershov, 29.01.1980
Covering letter, A.G. Pavlenko->A.P. Ershov, 29.04.1980
Covering letter (hand-written), G. E.Tseitlin ->A.P. Ershov, 16.05.1980
Covering letter (hand-written), G. E.Tseitlin ->A.P. Ershov, 04.07.1980
Covering letter, V. P. Tikhomirov->A.P. Ershov, 15.07.1980
Covering letter (hand-written), Unknown Author->A.P. Ershov, 25.09.1980
Covering letter (hand-written), Unknown Author->A.P. Ershov, 16.10.1980
Covering letter, T.V. Ryabushkin->A.P. Ershov, 08.10.1980
Covering letter, G. E.Tseitlin ->A.P. Ershov, 04.11.1980
Covering letter (hand-written), S. M. Abramovich->A.P. Ershov, 25.12.1980
Covering Letter, A. O. Slisenko->A.P. Ershov, 27.03.1980
Covering Letter, A. N. Maslov->A.P. Ershov, 22.05.1980
Covering letter, I.D. Vaisband->A.P. Ershov, 17.10.1980
Information letter, V. A. Koptyug->A.P. Ershov, 10.01.1980
Information letter, V.A. Proskuryakov->A.P. Ershov, 18.03.1980
Information letter, H. Khinov->A.P. Ershov, 04.08.1980
Information letter, S. A. Kozyrev->A.P. Ershov, 17.11.1980
Information letter, Organizing Committee->A.P. Ershov, 15.12.1980
Letter, V. Chavchanidze->A.P. Ershov, 15.01.1980
Letter, V. Sh. Kaufman ->A.P. Ershov, 20.01.1980Invitation to take part in the celebration of E.A. Zhogolev's 50th birthday anniversary
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