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2. The Natural Vegetation of Trinidad;Beard,1946
3. Birds of the colony of Trinidad and Tobago Part 3;Belcher;Ibis Series,1936
4. Brooks, R.L., 1935. Forests and forestry in Trinidad and Tobago. A statement prepared for the British Empire Forestry Conference, South Africa. Government Printer, Trinidad.
5. Neotropical parrots as agricultural pests;Bucher,1992