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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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Rubber statistics 1900-1937 : production, absorption, stocks and prices / by P.W. Barker ; prep. under the dir. of E.G. Holt.
- Government Printing Office,
- 1938.
- Washington, DC :