00617nam a2200205 a 450000100080000000500110000800800410001910000160006024500700007626000430014630000100018949000340019950000580023365000160029165000180030765000300032570000200035570000180037570000180039310017392014-02-22       1971    bl uuuu     u00u1 u    #d1 aBLACK, C.A.  aAgronomy in a changing world and research needs for the seventies  aWisconsin (USA): ASA, CSSA, SSSAc1971  a65 p.  a(ASA Special Publication; 19)  aDonación Dr. Douglas Sanders (INIA Las Brujas, 2007)  aAGRICULTURA  aINVESTIGACION  aPOLITICA DE INVESTIGACION1 aVAN RIPER, G.E.1 aBURROWS, W.C.1 aHOLLAND, R.F.