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Print copies of selected National Agroforestry Center publications are available upon request. The National Agroforestry Center continually adds and updates publications and let quantities of others deplete based on their timeliness. Certain publications may be only available in limited numbers or may not be available in print. You are free to photocopy, print, or download items from our website as needed. All USDA publications and broadcasts are free for public use and may be reproduced for non-profit purposes. Please credit the USDA National Agroforestry Center.