Letter with attachment, V. M. Glushkov->A.P. Ershov, 10.09.1971
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
Telegram, A.P. Ershov->W. Dijkhuis, 28.01.1977
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
Card, 11.07.1978
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
Letter, J. Kastelein->A.P. Ershov, 19.03.1979
Letter with attachment, W. Dijkhuis->A.P. Ershov, 03.05.1979
Letter, W. Dijkhuis->A.P. Ershov, 21.05.1979
Letter, W. Dijkhuis->A.P. Ershov, 02.07.1979
Letter, W. Dijkhuis->A.P. Ershov, 31.07.1979
Letter, W. Dijkhuis->A.P. Ershov, 16.10.1979
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