| Telegram, 21.01.1970 confirmation acknowledgement of participation
Telegram, 25.12.19695 invitations reserved
Telegram, 19.12.1969confirmation acknowledgement of participation
Letter, 26.12.1969confirmation acknowledgement of participation
Letter, 17.12.1969confirmation acknowledgement of participation
Letter, 19.12.1969confirmation acknowledgement of participation
Letter, 13.11.19694 invitations are reserved
Letter, 16.01.19702 invitations are reserved
Telegram, 17.12.1969Request to specify the number of participants
Letter, 27.01.19702 invitations are reserved
Telegram, 27.01.19701 invitation reserved
Telegram, 23.01.1970OK for Glimakov and Plesnevich
Telegram, 23.01.19701 invitation reserved
Telegram, 21.01.19702 invitations are reserved
Telegram, 21.01.19701 invitation reserved
Letter, 07.01.19703 invitations are reserved
Letter, 20.01.19701 invitation reserved
Letter, 20.01.19702 invitations are reserved
Telegram, 20.01.19701 invitation reserved
Telegram, 16.01.19701 invitation reserved
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