The Jean Starr Untermeyer collection contains over 3,000 letters to Jean Starr Untermeyer and in some cases to Louis Untermeyer from a list of distinguished people including Louise Bogan, Bryher, H.D., Norman Holmes Pearson, Marianne Moore, May Sarton, Charles D. Abbott, Anne Sexton, Edith Sitwell, William Carlos Williams, Stanley Kunitz, Sara Teasdale, Amy Lowell, Vachel Lindsay, Sylvia Townsend Warner, Albert Einstein, and Lukas Foss; Jean Starr Untermeyer's letters to Jule Brousseau Roth, Richard Untermeyer, Charles D. Abbott, Louis Untermeyer, and others; Louis Untermeyer's letters to Charles D. Abbott, Richard Untermeyer, Jean Starr Untermeyer, and others; various manuscripts for individual poems and prose works by Jean Starr Untermeyer and Louis Untermeyer; typescripts with corrections for Private Collection; Hermann Broch's typescript for Der Tod Des Vergil; typescripts with corrections for three different versions of Jean Starr Untermeyer's translation of Broch's The Death of Virgil; typescripts and proofs for Poets at Work: Essays Based on the Modern Poetry Collection at the Lockwood Memorial Library, University of Buffalo (1948); various auxiliary manuscripts by other authors; photographs of Jean Starr Untermeyer, Louis Untermeyer, Sylvia Townsend Warner, Valentine Ackland, Vachel Lindsay, Siegfried Sassoon, and others; and miscellaneous peripheral items.