Letter, Meshkov ->A.P. Ershov, 05.01.1987(?)
Letter, 14.01.1987
Letter, V. P. Romanenko ->A.P. Ershov, 16.01.1987
Letter, A.T. Groysberg->A.P. Ershov, 17.01.1987
Letter, Yu. A. Pervin ->A.P. Ershov, 20.01.1987
Letter, 26.01.1987
Covering letter, 28.01.1987
Letter, 29.01.1987
Letter, M. B. Ignatiev->A.P. Ershov, 19.01.1987
Letter, A. L. Adamishin->A.P. Ershov, 12.02.1987
Note, Unknown Author->A.P. Ershov, 17.02.1987
Letter, N.P. Polichka->L. V. Gorodniaia, 17.02.1987
Letter, A.K. Ailamzyan->A.P. Ershov, 25.02.1987Invitation to take part in a Young Programmers' Summer School in Pereslavl-Zalesskiy
Telephone Message, 04.12.1987
Covering letter, Burgin M. S.->A.P. Ershov, 25.11.1987
Letter, M.P. Lapchik->A.P. Ershov, 13.10.1987
Letter, 21.09.1987
Information letter, Organizing Committee->A.P. Ershov, 07.09.1987
Letter, 20.07.1987(?)
Letter, Melnikov N.N.->A.P. Ershov, 04.03.1987
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