We have information from several sources:
Simon, J.E., A.F. Chadwick and L.E. Craker. 1984. Herbs: An Indexed Bibliography. 19711980.
Growing and Marketing Woodland Botanicals—Jeanine M. Davis
Commercial Production of Ginseng and GoldensealL.P. Stoltz
Alternative Crops Research in VirginiaHarbans L. Bhardwaj, Andy Hankins, Tadesse Mebrahtu, Jimmy Mullins, Muddappa Rangappa, Ozzie Abaye, and Gregory E. Welbaum
Phytomedicines as a New Crop OpportunityLoren D. Israelsen
Sievers, A.F. 1930. The Herb Hunters Guide. Misc. Publ. No. 77. USDA, Washington DC.
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