00641nam a2200169Ia 4500020001500000082001600015245008600031260004800117300000800165440005100173546001200224650006300236650005900299650005300358650004200411700001800453  a8170224020  a630bNOO/NE  aNew dimensions in agricultural geography V.2:bthe ecology of agricultural system  aNew DelhibConcept Publishing Companyc1992  a334  aConcept's International Series in Geographyv4  aEnglish  aEnvironmental assessment for sustainable rural development  aAgricultural performance in different ecological zones  aGeomorphic problems of agriculture in arid lands  aLand degradation in the Indian desert  aNoor Mohammad