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International conference on impacts of agricultural research and development: why has impact assessment research not made more of a difference? is written by David J. Watson and published by CIMMYT. It's available with International Standard Book Number or ISBN identification 9706481044 (ISBN 10) and 9789706481047 (ISBN 13).
Proceedings of a conference by the Standing Panel on Impact Assessment (SPIA) of the Interim Science Council, Consultative Group on International Agricultural Research (CGIAR) and the Economics Program, the International Maize and Wheat Improvement Center (CIMMYT), 4-7 February 2002, San José, Costa Rica.