Youngken, Heber Wilkinson.

A text book of pharmacognosy / by Heber W. Youngken with 469 illustrations containing about 1500 figures. - 4th ed. rev. and enl. - Philadelphia : P. Blakiston's son & co., inc., [c1936] - xiv, 924 p. : ill. ; 24 cm.

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Pharmacognosy.

615.32 / YOU