- Poets, American -- 19th century -- Correspondence
- Novelists, English -- 19th century -- Correspondence
- Cartoonists -- United States -- Correspondence
- Presidents' spouses -- United States -- Correspondence -- Fiction
- Moltke, Helmuth James, Graf von, 1907-1945 -- Correspondence
- Rilke, Rainer Maria, 1875-1926 -- Correspondence
- Wilson, Edward O. -- Correspondence
- Generals -- United States -- Correspondence
- Parkhurst, John, 1826-1917. -- Correspondence
- Conductors (Music) -- United States -- Correspondence
- Gogh, Elisabeth du Quesne van, 1859-1936 -- Correspondence
- Chase-Riboud, Barbara -- Correspondence
- Adams, Abigail, 1744-1818 -- Correspondence
- Porter, Cole, 1891-1964 -- Correspondence
- African American authors -- Correspondence
- Le Carré, John, 1931-2020 -- Correspondence
- Sacks, Oliver, 1933-2015 -- Correspondence
- Quenon, Paul -- Correspondence
- Jewish refugees -- United States -- Correspondence
- Koh, EJ, 1988- -- Correspondence
- Audubon, John James, 1785-1851 -- Correspondence
- Freeman, Dorothy, 1898-1978 -- Correspondence
- Novelists, Russian -- 19th century -- Correspondence
- Dog owners -- Correspondence