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2. Présent et avenir de la Pharmacognosie;Farnsworth;Plantes médicinales et Phytothérapie,1979
3. A history of British Pharmacognosy;Shellard;Pharmaceutical Journal,1980
4. Medicine among the American Indians;Stone,1962
5. Science and Secrets of Early Medicine. Egypt, Mesopotamia, India, China, Mexico, Peru.;Thorwald,1962