Covering letter, A.P. Ershov->W. Hoffmann, 25.02.1959
Covering letter with attachment, A.P. Ershov->P. Ivey, 06.06.1959
Covering letter, A.P. Ershov->Leiberstein, 15.12.1959
Letter, A.P. Ershov->J. Carr III, 20.01.1959(?)
Letter, A.P. Ershov->A. J. Perlis, 21.01.1959
Letter, A.P. Ershov->W. Hoffmann, 10.02.1959(?)
Letter, A. A. Dorodnitsyn->W. Heise..., 10.02.1959(?)
Letter, A.P. Ershov->E. Fox, 12.02.1959
Letter, A.P. Ershov->D. V. Blake, 20.02.1959Thanks for publishing the paper and answers to Prof. Woodger's questions
Letter, A.P. Ershov->R. Goodman, 25.12.1959
Letter, A.P. Ershov->W. Hoffmann, 20.02.1959
Letter, A.P. Ershov->A. J. Perlis, 09.03.1959
Letter, A.P. Ershov->E. J. Guerin, 10.03.1959
Letter, 23.03.1959
Letter, A.P. Ershov->J. McCarthy, 27.04.1959Thanks for the paper; hopes for visiting US and meeting this summer; Reprint of last publication is enclosed
Letter, A.P. Ershov->A. J. Perlis, 09.05.1959
Letter, A.P. Ershov->W. Hoffmann, 13.05.1959
Letter, A.P. Ershov->J. Carr III, 20.05.1959(?)Thanks for the invitation; request to send the program of the visit approved by Prof. Perlis; several personal questions
Letter, A.P. Ershov->J. H. Wegstein, 29.05.1959
Letter, A.P. Ershov->J. Carr III, 29.05.1959
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