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References

Bailey R. G. 1989. Explanatory supplement to Ecoregions of the Continents. Environmental Conservation, Volume 16 No 4, Switzerland.

Bailey R. G. 1995. Description of Ecoregions of United States. USDA FS Publication No 1391, Washington DC USA.

Bailey, R.G. 1996. Ecosystem Geography. New York: Springer Verlag. 216p.

Bailey R. G. 1998. Ecoregion Map of North America. USDA FS Publication No 1548, Washington DC USA.

Bailey R. G.Personal communication by email message to Mr. K.D. Singh, November 6, 1998. (paraphrasing p.160 in Ecosystem Geography, Bailey 1996)

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FAO. 1989. Classification and Mapping of Vegetation Types in Tropical Asia. Rome.

Holdridge, L.R. 1947. Determination of world plant formations from simple climatic data. Science, 105:367-368.

Köppen. 1931. Grundrisse der Klimakunde. Walter de Gruyter Co. Berlin.

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Thornthwaite C. W. 1931. The Climates of North America according to a New Classification. John Wiley & Sons, New York.

Thornthwaite C. W. 1933. The Climates of Earth. Geographic Review 23.

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UNESCO. 1973. International classification and mapping of vegetation, series 6. Ecology and Conservation, Paris, France: 93 p.

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