Letter, 09.03.1987
Letter, Gurevich V. Yu.->A.P. Ershov, 07.09.1987
Card, 17.03.1987
Invitation, Organizing Committee->A.P. Ershov, 17.03.1987
Invitation, 20.03.1987
Letter, 20.03.1987
Letter with attachment, A.K. Ailamzyan->A.P. Ershov, 01.04.1987
Letter, 04.09.1987
Letter, 02.04.1987
Information letter, 20.04.1987
Teletype Message, 30.04.1987
Letter, V.P. Necterenko->A.P. Ershov, 29.07.1987
Covering letter, 01.07.1987
Letter with attachment, 11.05.1987
Letter, S.P. Gladysh->A.P. Ershov, 11.05.1987
Letter, 25.05.1987
Covering letter, L. F. Sternberg->A.P. Ershov, 10.06.1987
Letter, V.M. Samosudov->A.P. Ershov, 22.06.1987
Letter, S. I. Shapiro ->A.P. Ershov, 26.06.1987with the words of deep gratitude for propagation of school informatics; an account of adapting some of more complex tasks from the informatics textbook for a calculator
Letter, Malov N.V.->A.P. Ershov, 26.06.1986
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