ID:DA1152806X
Heinrich, G. (Geoffrey)
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by G.M. Heinrrich and E. Modiakgotla and J. Uquillas and B. Navas
Agricultural Administration Unit, Overseas Development Institute 1993 Network paper / ODI, Agricultural Administration (Research and Extension) Network 39
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by Geoffrey M. Heinrich
International Service for National Agricultural Research [1993] OFCOR discussion paper / International Service for National Agricultural Research no. 3