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Report, 24.01.1983
Report, 20.01.1984(?)
Telegram, M. Nivat->A.P. Ershov, 20.10.1984
Memo, I.V. Pottosin->A.P. Ershov, 10.01.1984(?)
Proposals, 29.03.1985
Letter, 05.09.1985
Plan, 20.12.1970(?)
Letter, E. P. Maxakov->A. S. Alekseev, 15.02.1988
List, 15.02.1988
Covering letter, S. A. Sanina->A.P. Ershov, 24.02.1988
Proposals
Report, 10.11.1985
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