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Order, 24.01.1983
Letter, M. M. Lavrentiev->A.P. Ershov, 01.03.1983(?)
Order, 18.11.1985
Letter, V. A. Cheverda->A.P. Ershov, 26.11.1985
List, 12.02.1986-09.10.1986
Regulations
List, 15.03.1977
List, 15.03.1977
List, 15.02.1978
Order, G. I. Marchuk->A.P. Ershov
Pilot Project, 01.07.1986(?)-01.07.1988(?)
Order, 01.12.1969
Order
Letter, V. P. Kochergin->A.P. Ershov
Order, 13.07.1972
List
Agreement
Direction, 29.05.1973
Order, 30.05.1973
Regulations, 31.05.1973
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