Agreement, 29.10.1977
Contract, 23.10.1979
Letter, 19.05.1980
Letter, 25.05.1980
Letter, A. N. Zvonova->A.P. Ershov, 16.07.1980
Letter, A. N. Zvonova->A.P. Ershov, 01.08.1980
Agreement, 08.09.1980
Letter, 06.01.1981
Letter, A.P. Ershov->A. N. Zvonova, 26.08.1981
Letter, 06.09.1982
Letter, 09.03.1981
Letter, 18.10.1982
Letter, V. A. Boldyrev->A.P. Ershov, 21.09.1973The publishers plan to start regular publication of translated books in computer technology and ask Ershov to advance his opinion on the series and to suggest books for translation.
Telegram, A.P. Ershov->N. V. Dmitrieva, 13.12.1977
Letter, A. N. Zvonova->A.P. Ershov, 25.10.1977
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