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- 21 nov 2014
- https://www.rhs.org.uk/plants/search-form
- Royal Horticultural Society
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- Journal of Alternative and Complementary Medicine
- 21 nov 2014
- http://www.liebertpub.com/acm
- Mary Ann Liebert, Inc. Publishers
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- USDA Nutrient Database
- U.S. Department of Agriculture
- 02 oct 2014
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- FAOSTAT
- Food and Agriculture Organization of the United Nations
- 02 oct 2014
- http://faostat3.fao.org/faostat-gateway/go/to/home/E