Leaves of Grass is a poetry collection by the American poet Walt Whitman (1819–1892). Although the first edition was published in 1855, Whitman spent most of his professional life writing and re-writing Leaves of Grass, revising it multiple times until his death. This resulted in vastly different editions over four decades—the first, a small book of twelve poems and the last, a compilation of over 400.

https://en.wikipedia.org/wiki/Leaves_of_Grass

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