References
1. A. E. Hagerman, Tannin Handbook (pdf version), Oxford, 2002.
2. A. Cannas' Tannins webpage, found at: www.ansci.cornell.edu/plants/toxicagents/tannin
Pictures:
P. Delaveau et al., Secretes et vertus des plantes médicinales, Milan, 1980.
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