Covering Letter, Yu. Mikheev->A.P. Ershov, 17.12.1968
Explanatory note, 27.11.1982on the structure of Main Administration of Computing Machines and Control Systems(with Ershov's hand-written addition: "Prepared together with V.I. Salikovskiy on the instruction of G.I.Marchuk")
Information, 10.10.1970
Invitation, N. F. Niznaiko ->A.P. Ershov, 17.04.1978
Invitation, N. F. Niznaiko ->A.P. Ershov, 15.11.1978
Invitation, Yu. A. Shebeko->A.P. Ershov, 08.12.1978
Invitation, 05.10.1982
Invitation, N. F. Niznaiko ->A.P. Ershov, 26.12.1974
Invitation, V. M. Glushkov->A.P. Ershov, 29.02.1972
Invitation, N. F. Niznaiko ->A.P. Ershov, 13.06.1972
Invitation, N. F. Niznaiko ->A.P. Ershov, 17.11.1972
Invitation, N. F. Niznaiko ->A.P. Ershov..., 22.03.1973
Invitation, N. F. Niznaiko ->A.P. Ershov, 04.05.1973
Invitation, N. F. Niznaiko ->A.P. Ershov, 12.06.1973
Invitation, V. A. Kotelnikov->A.P. Ershov, 08.05.1970
Letter, 15.08.1977
Letter, N. F. Niznaiko ->A.P. Ershov, 12.05.1977
Letter, A.A. Soldatenkov->A.P. Ershov, 26.04.1984
Letter with attachment, N. F. Niznaiko ->A.P. Ershov, 07.12.1978
Letter with attachment, N. F. Niznaiko ->A.P. Ershov, 03.04.1979
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