- Authors, French -- 20th century -- Correspondence
- Proust, Marcel, 1871-1922 -- Correspondence
- Women -- United States -- Correspondence
- Children -- Correspondence
- Painters -- Netherlands -- Correspondence -- Juvenile literature
- Santa Claus, (Fictitious character) -- Correspondence -- Juvenile fiction
- Maxwell, William, 1908-2000 -- Correspondence
- Arendt, Hannah, 1906-1975 -- Correspondence
- Roosevelt, Eleanor, 1884-1962 -- Correspondence -- Fiction
- Breed, Clara E. -- Correspondence -- Juvenile literature
- Novelists, Irish -- Correspondence
- Actors -- United States -- Correspondence
- Pasternak, Boris Leonidovich, 1890-1960 -- Correspondence
- Knausgård, Karl Ove, 1968- -- Correspondence
- Lennon, John, 1940-1980 -- Correspondence
- Environmentalists -- Correspondence
- Presidents' spouses -- United States -- Correspondence
- Soldiers -- Canada -- Correspondence
- Ganda, Martin -- Correspondence
- Primatologists -- Correspondence
- Booksellers and bookselling -- Great Britain -- Correspondence
- Tolkien, J. R. R., Tolkien, J. R. R., John Ronald Reuel, John Ronald Reuel, 1892-1973., 1892-1973 -- Correspondence
- Bonhoeffer, Dietrich, 1906-1945 -- Correspondence
- Fitzgerald, Zelda, 1900-1948 -- Correspondence
- Women authors, American -- 20th century -- Correspondence
- Artists -- United States -- Correspondence
- Hamilton, Alexander, 1757-1804 -- Correspondence
- McCarthy, Mary, 1912-1989 -- Correspondence
- Amyotrophic lateral sclerosis + Patients -- Correspondence
- Pacifists -- Great Britain -- Correspondence
- Authors, Russian -- 20th century -- Correspondence
- Periodical editors -- United States -- Correspondence
- Authors, English -- 20th century -- Correspondence
- Authors, German -- 20th century -- Correspondence
- Obata, Chiura -- Correspondence
- Dahl, Roald -- Correspondence
- Authors's spouses -- United States -- Correspondence
- De Waal, Edmund -- Correspondence
- Women biologists -- Correspondence
- Soldiers -- United States -- Correspondence
- Breed, Clara E., Clara Estelle, 1906-1994 -- Correspondence -- Juvenile literature
- Women environmentalists -- Correspondence
- Warner, Sylvia Townsend, 1893-1978 -- Correspondence
- Thoreau, Henry David, 1817-1862 -- Correspondence
- Poor children -- United States -- Correspondence
- Mothers and daughters -- Correspondence
- Lee, Harper -- Correspondence
- Galilei, Maria Celeste, 1600-1634 -- Correspondence
- Truman, Harry S., 1884-1972 -- Correspondence
- Roosevelt, Eleanor, 1884-1962 -- Correspondence