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Lloyd, J. U. (1898). "Croton tigliumArchivado el 1 de agosto de 2003 en Wayback Machine.". Lloyd Brothers plant drug pamphlets, Lloyd Brothers Pharmacy: Cincinnati.
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Lloyd, J. U. (1898). "Croton tigliumArchivado el 1 de agosto de 2003 en Wayback Machine.". Lloyd Brothers plant drug pamphlets, Lloyd Brothers Pharmacy: Cincinnati.