| Letter, 13.11.1969 4 invitations are reserved
Letter, 17.12.1969confirmation acknowledgement of participation
Telegram, 17.12.1969Request to specify the number of participants
Telegram, 19.12.1969confirmation acknowledgement of participation
Letter, 19.12.1969confirmation acknowledgement of participation
Telegram, 25.12.19695 invitations reserved
Letter, 26.12.1969confirmation acknowledgement of participation
Telegram, 30.12.19692 invitations are reserved
Telegram, 31.12.19691 invitation reserved
Telegram, 05.01.19702 invitations are reserved
Telegram, 05.01.19702 invitations are reserved
Telegram, 05.01.19702 invitations are reserved
Telegram, 05.01.19702 invitations are reserved
Letter, 07.01.19703 invitations are reserved
Telegram, 07.01.19702 invitations are reserved
Telegram, 07.01.1970confirmation acknowledgement of participation
Telegram, 08.01.1970confirmation acknowledgement of participation
Telegram, 08.01.19701 invitation reserved
Telegram, A.P. Ershov->N. Krasnoyarov, 08.01.19701 invitation reserved
Telegram, 12.01.19701 invitation reserved
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