A methodology for on-farm cropping systems research Zandstra, H. G. creator text ph Manila IRRI c1981 monographic eng
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147 p.: ill. ; 23 cm. by H. G. Zandstra....[et. al. ] Cropping systems 631.582 ZAM BD-DhSAU 150508 20150508180934.0 BD-DhSAU 6453