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Fosdick. Harry Emerson. New York. 27 Jan 1953. To Adele C. Brockhoff. t.l.s. 1p. (with t.copy of letter from Helen Keller to Fosdick. 18 Feb 1953. and t.copy of his reply, 27 Feb 1953)
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Hemingway. Patrick M. and Henriette Broyles Hemingway (Mrs. Patrick M.) East Africa [ca.1952) To Adele C. Brockhoff. a.l.s. (in the hand of Mrs. Hemingway)
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Hemingway. Pauline Pfeitter (Mrs. Ernest) Key West, Fla., 2 June 1951 & [n.d.], To Adele C. Brockhoff, 1 a.l.s., 3 t.l.s., June 1951
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Keller, Helen. Seattle. 27 May 1946. To Gustevus A. Pfeitter. t.l.s., 2p.
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Keller, Helen. Westport. Conn. 1949 -1957. To Adela C. Brockhoff. a.1.s., 7 t.l.s., 1949
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Keller, Helen. [Westport. Conn.] Christmas 1949 -1950. To [Adela C. Brockhoff) 2 p.c.s. (2 Christmas cards, signed by Miss Keller and Polly Thompson), 1949
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Nixon. Patricia Ryan (Mrs Richard N.) Washington, 12 July 1972. To Adela C. Brockhoff t.l.s, 1p. (with envelope)
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Reagan, Nancy (Mrs Ronald) Washington, 16 November 1981. To Adela C. Brockhoff t.l.s., 1p.
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Thompson, Polly. Westport, Conn., 1952 - 1957 & n.d. To Adele C. Brockhoff a.1.s. (written on behalf and signed for Helen Keller and herself), 1952, 1957, n.d.
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Thompson, Polly. n.p., n.d. To Adele C. Brockhoff. a.l.s., 1.p. (With envelope; removed from Helen Keller, My Religion, 1927), n.d.