Arranged in chronological order.
| Fragment of typed letter, 1956 September 18 | 1 item (1 p.) | Box 66, F0947 |
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Only one quarter of the letter survived mailing. |
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| Typed letter signed with envelope, 1957 June 30 | 1 item (2 p.) | Box 66, F0947 |
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Bowles enclosed the previous letter fragment with this letter. |
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| Autograph letter signed with envelope, 1958 April 10 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1958 May 13 | 1 item (2 p.) | Box 66, F0947 |
| Typed letter signed, 1959 December 28 | 1 item (1 p.) | Box 66, F0947 |
| Autograph letter signed with envelope, 1960 January 28 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1960 May 2 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1965 May 17 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1965 June 6 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter (aerogramme) signed, 1966 November 23 | 1 item (2 p.) | Box 66, F0947 |
| Autograph letter (aerogramme) signed, 1968 October 10 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1973 May 13 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1977 February 9 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed with envelope, 1984 May 16 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1984 August 7 | 1 item (1 p.) | Box 66, F0947 |
| Typed letter signed, 1985 August 28 | 1 item (1 p.) | Box 66, F0947 |
| Autograph letter signed with envelope, 1991 June 12 | 1 item (1 p.) | Box 66, F0947 |
| Autograph letter signed with envelope, 1991 October 12 | 1 item (1 p.) | Box 66, F0947 |
| Autograph card signed, [circa 1970] December 11 | 1 item (1 p.) | Box 66, F0947 |