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Perry, Bliss. Walt Whitman: his Life and Work. 1906 and 1908.

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Traubel, H. L. With Walt Whitman in Camden, p. 473. 1906. (This is Vol. I of Traubel’s diary notes made during Whitman’s life. Vol. II, 1908; Vol. III, 1914. Vol. IV is announced for early publication, and the whole work, when completed, will fill eight or ten volumes.)