Copy of the telegram, J. T. Schwartz->A.P. Ershov, 04.02.1976
Copy of the letter, A. E. Pardee->Yu. Baraboshkin, 10.06.1980
Copy of the letter, H. McMains->V. B. Bezroukov, 18.03.1975
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 26.05.1977
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 18.07.1977
Covering letter, A.P. Ershov->B. I. Rameev, 16.11.1977
Covering letter, A.P. Ershov->V. V. Shurakov, 17.07.1978
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 19.04.1979
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 10.08.1979
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 09.04.1980
Covering letter, Yu. Baraboshkin ->A.P. Ershov, 07.07.1980
Letter, G. I. Marchuk->V. V. Pazelskiy, 18.04.1968
Letter, Yu. Baraboshkin ->A.P. Ershov, 14.08.1979
Letter, G. I. Marchuk->B. I. Rameev, 14.09.1973
Letter, D. Aufenkamp->A.P. Ershov, 31.01.1975
Letter, A.P. Ershov->J. T. Schwartz, 30.01.1979Account of the circumstances that made impossible Ershov participation in the next WG 2.1 meeting; news on the SETL project and some other current affairs.
Letter, D. Aufenkamp->A.P. Ershov, 01.12.1975
Letter, V. V. Shurakov->A.P. Ershov, 15.12.1975
Letter, A.P. Ershov->J. T. Schwartz, 02.07.1976
Letter, Yu. Baraboshkin ->A.P. Ershov, 29.12.1976
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