Letter, H. Gerbrandy->A.P. Ershov, 02.12.1986
Letter with attachment, H. Gerbrandy->A.P. Ershov, 11.02.1987
Letter with attachment, A. Sevenster->A.P. Ershov, 16.03.1987
Letter with attachment, A. Sevenster->A.P. Ershov, 30.06.1987
Letter, A.P. Ershov->A. Sevenster, 13.07.1987In reply to the addressee's letter of March 16, 1987 on reimbursement, the author wants to have an opportunity occasionally to request some of North Holland publications interesting to him. (Handwritten and typewritten texts)
Letter, A. Sevenster->A.P. Ershov, 07.08.1987
Letter, A. Sevenster->A.P. Ershov, 20.08.1987
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 with attachment, H. Gerbrandy->A.P. Ershov, 11.11.1987
Covering letter, H. Gerbrandy->A.P. Ershov, 22.12.1987
Letter, G. R. Andrews->A. Sevenster, 28.01.1988
Covering letter, H. Gerbrandy->A.P. Ershov, 25.02.1988
Letter with attachment, D. Gries->H. Gerbrandy, 31.03.1988
Letter, A. Sevenster->A.P. Ershov, 29.04.1988
Letter, H. Gerbrandy->A.P. Ershov, 03.05.1988
Card, H. Gerbrandy->A.P. Ershov, 15.06.1988with compliments
Letter, A. Sevenster->A.P. Ershov, 28.06.1988
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