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World poverty and development : a survey of American opinion / Paul A. Laudicina ; with a forew. by John W. Sewell.
- 873
- Overseas Development Council,
- 1973.
- Washington, DC :
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Tropical forest ecosystems in Africa and South America : a comparative review / ed. by Betty J. Meggers, Edward S. Ayensu, and W. Donald Duckworth.
- Smithsonian Institution Press,
- 1973.
- Washington, DC :