| Letter, 22.09.1970 Ershov is referred to the Paster Office of the Hospital ¹22 for smallpox and cholera vaccination in connection with his future visit to the USA
Covering letter, I.V. Pottosin->V. K. Levin, 03.11.1970
Memo, A.P. Ershov->G. I. Marchuk, 08.12.1970Urgent request to provide acommodation for E.Tyugu, a research student from Tallinn
Letter, 09.12.1970
Telegram, A.P. Ershov->E. L. Yuschenko..., 22.12.1970on the actual state of affairs in SIGMA project
Mailing list, 29.12.1970-31.12.1970
Telegram, A.P. Ershov->P. P. Koryavov, 25.09.1970on Hoperskov's talk and possible Kotov's arrival
Telegram, 25.09.1970
Telegram, A.P. Ershov->I.V. Pottosin, 30.09.1970
Telegram, 13.10.1970Request to book a hotel for A.Ershov
Telegram, G. I. Marchuk->V.N. Petkevich, 13.10.1970Request to confirm hotel reservation for Ershov
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