Letter, M. Paul->o the members of IFIP WG 2.1, 22.06.1971
Letter, A.P. Ershov->W. L. van der Poel, 26.11.1968
Letter, B. J. Mailloux->A.P. Ershov, 17.06.1971
Letter, M. Paul->A.P. Ershov, 23.06.1971
Letter, M. Paul->A.P. Ershov, 28.06.1971
Letter, M. Paul->A.P. Ershov, 29.06.1971
Letter, M. Paul->A.P. Ershov, 05.07.1971
Letter, P. Branquart->A.P. Ershov, 07.07.1971
Letter, W. L. van der Poel->A.P. Ershov, 07.07.1971
Letter, H. Bekic->A.P. Ershov, 16.07.1971
Telegram, I. O. Kerner->A.P. Ershov, 28.07.1971
Letter, K. Samelson->A.P. Ershov, 15.07.1971
Letter, M. Sintzoff->A.P. Ershov, 13.07.1971thanking for the invitation and informing of the visit schedule
Letter, J. E. L. Peck->A.P. Ershov, 13.07.1971
Letter, M. Paul->A.P. Ershov, 15.07.1971
Letter, M. Paul->N. Suzuki, 06.07.1971
Letter, 10.07.1971(?)Information about the 15th session of the WG 2.1 in Novosibirskk that can be used as formal grounds for visa application
Letter, M. Paul->H. J. Bowlden, 22.06.1971
Letter, M. Paul->A.P. Ershov, 19.07.1971
Telegram, A. Wijngaarden, van->A.P. Ershov, 06.08.1971
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