lands degraded degradation estimates wastelands unit nrsc lup nbss extent nrsa 2005
soil erosion soils degraded area yr tonnes maji wastelands preliminary statistics assessment degradation organizations 2008a
maji acid 2008a soils source wastelands degraded preliminary spatial
rajasthan extent land degradation bhilwara wasteland degraded distribution wastelands
india desertification land deforestation soil its hosts convention delhi degradation