BUREAU OF PLANT INDUSTRY.

_Chief of Bureau_, +Beverly T. Galloway+.

_Assistant Chief of Bureau_, +William A. Taylor+.

_Editor_, +J. E. Rockwell+.

_Chief Clerk_, +James E. Jones+.

+Drug-Plant, Poisonous-Plant, Physiological, and Fermentation

Investigations.+

Wild volatile-oil plants and their economic importance · 第 7 / 57 题