| Letter, A. V. Petrova->A.P. Ershov, 18.12.1970 Request to send photographs in connection with being elected the USSR AS corresponding member
Telegram, S. G. Korneev->M. A. Lavrentiev, 21.01.1970
Invitation, V. M. Chistyakov->A.P. Ershov, 10.10.1970
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