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achieved admittedly Africa Amazon Basin American backwardness Bates biomass century ahead Civilization colonial Commission on Humid Congo Basin crops cultigens cultural adversities cultural take-off Developing World diversity domesticated Dudley Stamp Eastern Nigeria Easy Harvest ecological Economic Development Economics of Underdeveloped ecosystems endemic equatorial climates essay factors farming fertilizers Focus Geographical Review Gourou growth herbaceous high-productivity Hodder human humid tropical areas humid tropical climates humid tropical lands Humid Tropics Research industrial Industrialisation intermediate latitude K. J. Peltzer kinds Land Development Latin America London low latitude regions low population densities McGill University microclimate mineral Montane Natural Resources overseas possessions P. T. Bauer P. W. Richards plant production rainfall raw materials scientists shifting cultivation species studies survey temperatures Tosi and Voertman tree Tropical Agriculture tropical countries tropical diseases tropical environment tropical rain forest tropical societies Tropical Soils tropical world Underdeveloped Areas Underdeveloped Countries UNESCO Western wet tropics York zones