Documents associated with Joao Oliveira

Item 23. (Name does not exist in this language.)
Letter, A.P. Ershov->J. Oliveira, 15.12.1986
The author thanks for an invitation to the Congress on education, but unfortunately he cannot to attend by reason of being busy. He regrets an unique chance to discover the Latin America for himself. /Handwritten text./
Letter, J. Oliveira->A.P. Ershov, 17.10.1986

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