00462nam a22001577a 4500003000400000020001800004082002000022100001700042245012900059250001200188260004900200300000900249500001600258546001400274650001600288OSt  a93 83155 39 6  a634.773bPAU/VA  aPaulson Tham  aVazhakrishiyum prakruthi niyamangalumb/വാഴകൃഷിയും പ്രകൃതി നിയമങ്ങളും   a2nd ed.  aThiruvananthapurambChintha Publisherac2015  a56p.  avazhakrishi  aMalayalam  aAgriculture