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Lonchocarpus (Barbasco, Cube, and Timbo) : a review of recent literature / by R.C. Roark.
- United States department of agriculture. Bureau of entomology and plant quarantine. Division of insecticide investigations,
- 1938.
- Washington, DC :
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Tephrosia as an insecticide : a review of the literature / by R.C. Roark.
- United States department of agriculture. Bureau of entomology and plant quarantine. Division of insecticide investigations,
- 1937.
- Washington, DC :