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Variability of cereal yields: Sources of change and implications for agricultural research and policy
Jock R. Anderson, Peter B.R. Hazell, Lloyd T. EvansVolume:
12
Année:
1987
Langue:
english
Pages:
14
DOI:
10.1016/0306-9192(77)90021-5
Fichier:
PDF, 1.19 MB
english, 1987