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Willem Janssen
W.J.
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W. Janssen
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(ISBN-10)
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tion
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Planning Agricultural Research: A Sourcebook
978-O-85199-4O1-7
(O-85199-4O1-6)
2000
Govert Gijsbers · Helen Hambly Odame · Gerdien Meijerink
Willem Janssens