Invitation, 29.09.1975
Invitation, Organizing Committee->A.P. Ershov, 15.03.1971
Notification, 02.06.1972
Telephone Message, G. I. Marchuk->I.V. Pottosin, 13.02.1974
Letter, V. V. Shaydurov->A.P. Ershov, 01.02.1974(?)
Letter, 16.12.1974
Invitation, Yu, E. Nesterikhin->A.P. Ershov, 20.03.1979
Invitation, 27.04.1979
Brochure, 12.09.1979
Notification, 26.09.1980
Agenda, V.S.Grigoriev->A.P. Ershov, 04.10.1984
Information
Telephone Messages, N. F. Niznaiko ->A.P. Ershov..., 29.11.1986
Invitation, V. E. Kotov->A.P. Ershov, 03.12.1986
Proof, 25.04.1983of the article "40 years later, 30 years later, 20 years later...TODAY!" in memory of an outstanding engineer and great patriot N.I. Bessonov (with Ershov's hand-writted addition "From Karl Efimovich Levitin, July 6, 1983 (Protvino)")
Invitation, 21.12.1975
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