•1855 Self-published the first edition
•1856 Added new poems and revised old ones.
•1860 Began grouping poems thematically; includes “A Child’s Reminiscence,” which will become “Out of the Cradle, Endlessly Rocking”
•1867 Incorporates Drum-Taps (1865), including “When Lilacs Last in the Dooryard Bloom’d” and “O Captain, My Captain”
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