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When were Walt Whitman’s Civil War poems added to Leaves of Grass?

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“Walt Whitman, an American, one of the roughs, a kosmos” — Walt Whitman American poet Walt Whitman, photograph by Mathew Brady.

Walt Whitman’s Civil War poems, originally published as Drum-Taps and Sequel to Drum-Taps in 1865, were incorporated into the fourth edition of Leaves of Grass in 1867.12