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2. Global climate change and US agriculture;Adams;Nature,1990
3. The greenhouse effect, climatic change, and ecosystems: a synthesis of presnt knowledge;Bolin,1986
4. Research on the response of vegetation to elevated atmospheric carbon dioxide;Dahlman;J. of Env. Qual.,1985
5. Implications of increasing carbon dioxide and climate change for agricultural productivity and water resources;Goudriaan,1990