| Letter, 17.06.1983 request to send bibliography from the collected works "Computers and programming in education"
Letter, Zagdansky E.P.->A.P. Ershov, 14.05.1983asking for assistance in work over a film script about computerization
Letter, Omel'chenko N.A.->A.P. Ershov, 21.07.1983request to send bibliography from the collected works "Computers and programming in education"
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