Information letter, V. A. Koptyug->A.P. Ershov, 10.01.1980
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
Letter, G. A. Tsypkin->A.P. Ershov, 25.01.1980
Covering letter, Unknown Author->A.P. Ershov, 29.01.1980
Letter, A. A. Stogniy->A.P. Ershov, 04.02.1980
Letter, Unknown Author->A.P. Ershov, 05.02.1980
Letter (hand-written), G. K. Stolyarov->A.P. Ershov, 08.02.1980
Letter, Yu. I. Manin->A.P. Ershov, 13.02.1980Thanks for the letter and review; some latest thoughts concerning this work
Letter, A.I. Polovinkin->A.P. Ershov, 14.02.1980
Letter (hand-written), V. V. Amvrosenko->A.P. Ershov, 20.02.1980
Letter, L.M. Samushchenko->A.P. Ershov, 21.02.1980
Letter (hand-written), Unknown Author->A.P. Ershov, 26.02.1980
Information letter, V.A. Proskuryakov->A.P. Ershov, 18.03.1980
Letter, K. G. Zyuzina->A.P. Ershov, 23.03.1980
Letter (hand-written), V.I. Golosov->A.P. Ershov, 04.04.1980
Letter, V. M. Matrosov->A.P. Ershov, 07.04.1980
Letter, V. I. Gavrilenko->A.P. Ershov, 16.04.1980
Note, V. E. Kotov->A.P. Ershov, 25.04.1980
Covering letter, A.G. Pavlenko->A.P. Ershov, 29.04.1980
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