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Correspondence
Note, V. Bityutskov->A.P. Ershov, 02.07.1987
Covering letters, V. Bityutskov->A.P. Ershov, 02.11.1987
Telegram, A.P. Ershov->V. Bityutskov, 17.11.1987
Covering letter, V. Bityutskov->A.P. Ershov, 04.01.1988
Coveing letter, V. Bityutskov->A.P. Ershov, 06.01.1988
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