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The botany of Ephedra in relation to the yield of physiologically active substances
- "The Botany of ephedra in relation to the yield of physiologically active substances, by G. Weidman Groff and Guy W. Clark"
- "The botany of Ephedra in relation to the yield of physiologically active substances"
- "The botany of Ephedra in relation to the yield of physiologically active substances"@en