. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Bui. 111, Bureau of Entomology, U. S. Dept. of Agriculture. Plate Fig. 1.—Compressed-Air Spraying Machine, Showing Air Bottle, Tank, Reducing Valve, and Pressure Gauge. (Original.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology. Washington : G. P. O.

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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology