00534     2200205   4500001002100000035002000021245007700041100001700118260005000135300002900185084001100214082001100225650000900236650001700245650001500262650001400277650001900291990000900310990000900319INLIS000000000003198  a0010-0121001564  aThe economics of rice-fish production sytems in North Sumatra, Indonesia  aSirman Purba  aKIelbWissenschaftsverlag vauk kiel KG.c1998  ax, 181 p.c: ill.; 21 cm  a633.18  a633.18  aRICE  aFISH CULTURE  aPRODUCTION  aECONOMICS  aNORTH SUMATRA.  a4439  a4439