Letter, A.P. Ershov->D. G. Bobrov, 02.12.1966
Letter, A.P. Ershov->J. McCarthy, 02.12.1966sharing the impressions of the visit to France; telling about works on AIST and BETA projects and the situation with the planned trip to the USA
Letter, A.P. Ershov->M. P. Chinitz, 02.12.1966
Letter, A.P. Ershov->Lesk, 02.08.1966
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