00457    a2200157   4500020001500000082001600015100002500031245010500056260003300161300002000194440002700214650001400241650001300255650001600268650001500284  a9556120521  a338.17bGAM  aGamage, Dhanawardana  aSome issues related to sustainability of farming systems in the central highland region of Sri Lanka  aSri LankabHARTIc2002g2002  aviii,51p.c29cm  aResearch study No. 108  aEconomics  aproducts  aAgriculture  aproduction