Pharmacognosy / Varro E. Tyler, Lynn R. Brady, James E. Robbers. Tyler, Varro E. Brady, Lynn R., 1933- Robbers, James E. Pharmacognosy. Pharmacognosy. RS160 .T94 1981 615.32 19 TYP Includes bibliographies and index. Philadelphia : Lea & Febiger, c1981. c1981. 1981 Text X, 520 p. : eng