Letter, W. Dijkhuis->A.P. Ershov, 30.11.1979
Letter, 08.01.1980
Letter, W. Dijkhuis->A.P. Ershov, 18.06.1980
Letter, J. Kastelein->A.P. Ershov, 09.07.1980
Letter, A.P. Ershov->A. Sevenster, 21.09.1987The author thanks for the kind agreement with occasional applying for some publications of interest. He proposes candidature Dr.R.Sethi for substitution of Dr.Aho. (Handwritten text)
Letter, J. Kastelein->W. M. Turski, 05.08.1980
Letter, W. Dijkhuis->A.P. Ershov, 14.08.1980
Covering letter, J. Kastelein->A.P. Ershov, 18.09.1980
Letter, W. Dijkhuis->A.P. Ershov, 10.12.1980
Letter, J. Kastelein->A.P. Ershov, 08.01.1981
Letter, J. Plesnik->A.P. Ershov, 19.02.1981
Letter (hand-written), A.P. Ershov->J. Plesnik, 27.05.1981
Letter (hand-written), S. Rao->A.P. Ershov, 16.06.1982
Letter (hand-written), A.P. Ershov->S. Rao, 19.08.1982
Letter, M. Paul->A.P. Ershov, 11.07.1978
Letter, H. Gerbrandy->A.P. Ershov, 27.04.1982
Letter with attachment, D. Gries->A.P. Ershov..., 07.06.1982
Letter, W. Dijkhuis->A.P. Ershov, 15.06.1982
Letter (hand-written), L. Boasson->A.P. Ershov, 22.06.1982
Letter, J. Nievergelt->A.P. Ershov, 01.07.1982
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