有声读物: Roots and Leaves Themselves Alone

Walter "Walt" Whitman was an American poet, essayist, and journalist, in addition to publishing his poetry—was a volunteer nurse during the American Civil War. Whitman's major work, Leaves of Grass, was first published in 1855 with his own money. The work was an attempt at reaching out to the common person with an American epic. He continued expanding and revising it until his death in 1892. - Summary by Wikipedia