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Gladstar, Rosemary and Pamela Hirsch, Eds. Planting the Future: Saving Our Medicinal Herbs. Healing Arts Press, 2000, Rochester, Vermont. ISBN-13: 978-0892818945

Moerman, Daniel. Native American Ethnobotany. Timber Press, 1998, Portland, OR. ISBN-13: 978-0881924534

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