- Cummings, Amos J., Amos Jay, 1841-1902 -- Correspondence
- Nationalists -- Germany -- Correspondence
- Textile workers -- New England -- Correspondence
- Couples -- United States -- Correspondence
- Prisoners -- Correspondence -- Fiction
- Poor children -- United States -- Correspondence
- Lee, Harper -- Correspondence
- Naturalists -- United States -- Correspondence
- Women artists -- United States -- Correspondence
- Kappus, Franz Xaver, 1883-1966 -- Correspondence
- Mothers and sons -- United States -- Correspondence
- Children -- Correspondence -- Juvenile literature
- Hickok, Lorena A. -- Correspondence -- Fiction
- Biologists -- United States -- Correspondence
- Vanderbilt, Gloria, 1924-2019 -- Correspondence
- Pancake, Breece D'J, 1952-1979 -- Correspondence
- Whipple, Evangeline Simpson, 1857-1930 -- Correspondence
- Women dramatists, American -- 20th century -- Correspondence
- Lewes, Jock. -- Correspondence
- Scholem, Gershom, 1897-1982 -- Correspondence
- Wilder, Laura Ingalls, 1867-1957 -- Correspondence
- Valente, Judith -- Correspondence
- Washington, George, 1732-1799 -- Correspondence
- Cancer + Patients -- Correspondence
- Gogh, Vincent van, 1853-1890 -- Correspondence
- Onassis, Jacqueline Kennedy, 1929-1994 -- Correspondence
- Dickinson, Emily, 1830-1886 -- Correspondence
- Jews -- United States -- Correspondence
- Poets, American -- 20th century -- Correspondence
- Dostoyevsky, Fyodor, 1821-1881 -- Correspondence
- Artists -- United States -- Correspondence
- Gogh, Wil van, 1862-1941 -- Correspondence
- Historians -- United States -- Correspondence
- Ritvo, Max, 1990-2016 -- Correspondence
- Women environmentalists -- Correspondence
- Holmes, Sherlock -- Correspondence -- Fiction
- Chaykin, Maryla -- Correspondence
- Donner, Tamsen, 1801-1847 -- Correspondence
- Roosevelt, Eleanor, 1884-1962 -- Correspondence
- Kennedy, John F., John Fitzgerald, 1917-1963 -- Correspondence
- Chesterfield, Philip Dormer Stanhope, Earl of, 1694-1773 -- Correspondence
- Immigrants -- Argentina -- Correspondence
- Authors -- Correspondence
- Authors, American -- 20th Century -- Correspondence
- Novelists, English -- 20th century -- Correspondence
- Plath, Sylvia -- Correspondence
- Brooks, Noah, 1830-1903 -- Correspondence
- African Americans -- Correspondence
- Parkhurst, John, 1826-1917. -- Correspondence
- Conductors (Music) -- United States -- Correspondence