00539nam a2200157 a 45000010018000000050017000180080041000350900018000761000032000942450116001262600037002423000011002795010010002906500066003009990015003660000000000002022720260805124035.0070429s1997    us            000a  eng    a33М.03bP-970 aParcell D.L., Anderson J.R.10aAgricultural extension and research: Achivements and problems in national systems.pParcell D.L., Anderson J.R.  aWashingtonbThe World Bankc1997  a280 p.  aw/6454 aОтраслевыеaэкономическиеaнауки.  c7576d7576