Wallis, T.E. Textbook of pharmacognosy by T.E. Wallis. - 5th ed. - Delhi CBS Publishers and Distrubutors 2005 - xi, 652p.: ill.; 22cm. Subjects--Topical Terms: Pharmacognosy. Materia medica, Vegetable Pharmacy. Pharmacognosy Dewey Class. No.: 615.321 / W16T