00482nam a2200133 a 45000010018000000050017000180080041000351000032000762450116001082600037002243000011002615010010002726500066002820000000000002022720260805124035.0070429s1997    us            000a  eng  0 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.