Directions, G. I. Marchuk->A.P. Ershov, 12.11.1968 to Ershov for his trip to England
Justification, 12.11.1968of sending Ershov for the scientific assignment to England
Letter, V. P. Kochergin->M. A. Lavrentiev, 12.11.1968Request to consider Ershov's traveller's dossier
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