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Acknowledgement is made to the periodicals in which the poems originally appeared: International Socialist Review, The Masses, Liberator, Solidarity, Industrial Worker, Industrial Pioneer, New York Call, Daily Herald (London), Workers Monthly. Also to the Century Company, for permission to reprint Louis Untermeyer's "Caliban in the Coal Mines"; to Henry Holt & Co., for some of Sandburg's poems; to Alfred A. Knopf, for poems by James Oppenheim, and to the Leonard Press, for poems by Ralph Chaplin.
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