Feinberg Collection at the Library of CongressThe Feinberg-Whitman collection contains letters, notes, postcards, telegrams, poems, articles, essays, and memoranda written by Whitman; letters written to him by friends and admirers; memorabilia and printed materials; and a variety of draft manuscripts and proofs, many of them annotated and revised by Whitman, demonstrating his creative process and the development of ideas in his prose and poetry. Whitman's private concerns and interests, some of which would later be voiced in his writings, are revealed in diaries, notes, commonplace books, and notebooks.