United States. Bureau of Entomology and Plant Quarantine. (1943). Hopper mechanism for distribution of baits and dust by airplanes for insect control. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Hopper Mechanism for Distribution of Baits and Dust by Airplanes for Insect Control. [Washington]: [s.n.], 1943.
MLA (9th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Hopper Mechanism for Distribution of Baits and Dust by Airplanes for Insect Control. [s.n.], 1943.
Warning: These citations may not always be 100% accurate.