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  1. 1
    Paraquat-aided tillage technique in rice cultivation and their effects on plant growth and yield /
    by Khaw, Cheng Haw
    Published 1972
    Thesis Book
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  2. 2
    The performance of different shapes of blades in rotary tillage of wet padi soil /
    by Khoo, Dennis Chong-phoe
    Published 1967
    Thesis Book
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