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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 :
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United States-Philippine trade : with special reference to the Philippine independence act and other recent legislation / [chairman Robert O'Brien].
- Government Printing Office,
- 1937.
- Washington, DC :