Tyler, Varro E . Pharmacognosy / Varro E. Tyler; Lynn R. Brady and James E. Robbers. - Philadelphia : Lea & Febiger , 1988. - 519p. : ills ; 22cm . Includes index ISBN: 0812110714 NULL Subjects--Index Terms: PHARMACOGNOSY Dewey Class. No.: 615.321 / TYL/P