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Las enfermedades del cacao en la zona del Caribe / por R. Ciferri.
- Unión panamericana,
- 1931.
- Washington, DC :
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Excerpts from consular correspondence relating to insecticidal and fish-poison plants / by R.C. Roark.
- United States department of agriculture. Bureau of chemistry and soils. Insecticide division,
- 1931.
- Washington, DC :