Archive
Scientific and Technical Collaboration
Soviet-Bulgarian Scientific Collaboration
Correspondence
Item 1. (Name does not exist in this language.)
Item 2. (Name does not exist in this language.)
Item 3. (Name does not exist in this language.)
Letter, A.P. Ershov->B. Sendov, 29.04.1985
Item 5. (Name does not exist in this language.)
Letter with attachment, B. Sendov->A.P. Ershov, 18.11.1980
Report, 04.11.1980
Invitation, B. Sendov->A.P. Ershov, 30.09.1981
Letter, D. G. Skordev->A.P. Ershov, 01.02.1978

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