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  1. 1
    Principles of agronomy
    Printed Book
  2. 2
    Laser land levelling:a picture technology for Resource conservation
    由 Jat,M L
    出版 2006
    Report
  3. 3
    Addressing resource conservation issues in rice-wheat sysems of south asia:Resource book
    由 CIMMYT
    出版 2003
    Report
  4. 4
    Rainfed agriculture in India
    由 Venkateswarlu, J
    出版 2004
    Printed Book
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