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Letters to Sarah Helen Whitman
- "John Henry Ingram letters"
- "Ingram discusses research on his biography of Edgar Allan Poe, published later by J. Hogg (London : 1880), soliciting information on various topics including Poe's expulsion from West Point and his death. Ingram also writes regarding Whitman's articles and research."
- "Letters (Correspondence)"
- "Letters to Sarah Helen Whitman"