Telegram, A.P. Ershov->K. Samelson, 29.12.1969 consent to participate in the technical committee
Letter, A.P. Ershov->H. F. Ledgard, 29.12.1969explaining how to get an invitation to work in a Soviet institute or university
Letter, A.P. Ershov->M. A. Melkanoff, 29.12.1969thanks for the invitation and promises to make use of it during the trip to the USA
Telegram, A.P. Ershov->R. A. Farrand, 11.11.1969informing that the translation is OK
Telegram, A.P. Ershov->R. Desai, 18.11.1969notification of sending forward the work report
Letter, A.P. Ershov->R. Desai, 18.11.1969notification of sending forward the report and translation and the payable bill
Letter, A.P. Ershov->W. M. Turski, 16.12.1969discussion of current affairs
Letter, A.P. Ershov->E. A. Feigenbaum, 22.12.1969discussion of current affairs, notification of the visit to the USA in the 2nd quarter of 1970
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