| Photo, 10.12.1974 A.Ershov speaking at the Symposium
Letter, A. M. Lazarev->V. A. Kerdivarenko, 24.10.1973
Order, N. S. Egorov->A.P. Ershov..., 25.01.1974
Call for Papers, 27.02.1974
Letter, D. N. Todoroi->A.P. Ershov, 04.07.1974
Sketch of Letter
Sketch of Letter
Sketch of Letter
Sketch of Letter
Sketch of Letter
Sketch
Program, 10.12.1974-12.12.1974
Invitation Card and Programme, 10.12.1974-12.12.1974
Notes, 10.12.1974-12.12.1974
Paper, 10.12.1974
Letter, A.P. Ershov->Unknown addressee, 11.12.1974
Abstract, 17.02.1975
Article, 22.01.1975
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