Documents associated with P. S. Oraevsky

Item 2. (Name does not exist in this language.)
Letter, L. Iliev->A. S. Alekseev, 26.08.1980
Telegram, A.P. Ershov->Oraevsky, 29.04.1985(?)
about cancellation of a trip to Bulgaria because of the urgent hospitalization. /Handwritten text./
Submission letter, 15.03.1979(?)
for Ershov's treveller's dossier
Letter, A.P. Ershov->V. A. Koptyug, 22.01.1987
A.Ershov asks to give a consent to an invitation of two Chinese scientists for participation in International Work Meeting on "Expert Systems and Pattern Recognition". (in two addresses)

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