Card, 11.07.1978
Card, H. Gerbrandy->A.P. Ershov, 15.06.1988with compliments
Copy of the letter, A. Sevenster->A. V. Aho, 04.04.1986
Copy of the letter, A. Sevenster->P. Henderson, 09.09.1985
Covering letter, J. Kastelein->A.P. Ershov, 18.09.1980
Covering letter, 03.09.1985
Covering letter, H. Gerbrandy->A.P. Ershov, 22.12.1987
Covering letter, H. Gerbrandy->A.P. Ershov, 25.02.1988
Draft of the letter, A.P. Ershov->H. Gerbrandy, 28.04.1986
Letter, D. Gries->A.P. Ershov..., 29.06.1976
Letter, W. Dijkhuis->A.P. Ershov, 24.08.1976
Letter, W. Dijkhuis->A.P. Ershov, 22.12.1976
Letter, W. Dijkhuis->A.P. Ershov, 14.03.1977
Letter, W. Dijkhuis->A.P. Ershov, 25.03.1977
Letter, W. Dijkhuis->A.P. Ershov, 30.09.1977
Letter, W. Dijkhuis->A.P. Ershov, 09.11.1977
Letter, ->A.P. Ershov, 16.11.1977
Letter, W. Dijkhuis->A.P. Ershov, 12.05.1978
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, W. Dijkhuis->A.P. Ershov, 27.02.1979
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