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John R. Witcombe
(Witcombe, John R.)
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Alternatives for Seed Regulatory Reform: an Analysis of Variety Testing, Variety Regulation and Seed Quality Control (Agricultural Research and Extension Network (AgREN) Paper)
by Robert Tripp, Niels Louwaars, W. Joost Van Der Burg, Daljit Virk S., John R. Witcombe
ISBN 9780850032741 (978-0-85003-274-1)
Softcover, Overseas Development Institute, 1997
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Farmer Participatory Research for the Selection of Rainfed Rice Cultivars (Research Issues in Natural Resource Management)
by Arun Joshi, John R. Witcombe
ISBN 9780906250358 (978-0-906250-35-8)
Softcover, University of Wales,Swansea,Centre for Development Studies, 1995
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Impact of Farmer Participatory Research on Biodiversity of C
by John R. Witcombe
, Arun Joshi
ISBN 9780906250402 (978-0-906250-40-2)
Softcover, University of Wales,Swansea,Centre for Development Studies, 1996
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