The collection consists of the correspondence files, primarily from 1921-1924, of Broom, An International Magazine of the Arts, edited in Italy by Harold Loeb (Princeton Class of 1913) in association with Matthew Josephson, Alfred Kreymborg, Malcolm Cowley, and Lola Ridge. Approximately half of the collection consists of editorial and business correspondence between Loeb and his associates, while the balance contains few or single letters from over 150 American, British, and European authors and artists. Among the correspondents represented are Ernest Hemingway, F. Scott Fitzgerald, Sinclair Lewis, Ford Madox Ford, Jean Cocteau, Henri Matisse, Gertrude Stein, Edna St. Vincent Millay, Richard Aldington, Djuna Barnes, Sylvia Beach, Kay Boyle, Winifred Bryher, E. E. Cummings, André Gide, Aldous Huxley, Man Ray, and William Carlos Williams, as well as others. Some related newspaper clippings and manuscript lists are also present.

Researchers should note that correspondence for some authors has been arranged in a single folder, whereas others' correspondence is included in general alphabetical files for each letter. Where this occurs, a list of included names is present in a note at the folder-level. Some correspondents, whose names may not be listed, can also be found in relevant alphabetical files.