http://www.ciesin.org/docs/002-193/002-193.html Center for International Earth Science Information Network Desertification of arid lands Center for International Earth Science Information Network http://www.ciesin.org/docs/002-193/002-193.html Center for International Earth Science Information Network Center for International Earth Science Information Network http://www.ciesin.org/docs/002-193/002-193.html sandy wastelands http://www.ciesin.org/docs/002-193/002-193.html http://www.ciesin.org/docs/002-193/002-193.html Desertification of arid lands Desertification of Arid Land Desertification of Arid Lands sandy wastelands sandy wastelands sandy wastelands http://www.ciesin.org/docs/002-193/002-193.html Center for International Earth Science Information Network http://www.ciesin.org/docs/002-193/002-193.html Center for International Earth Science Information Network Desertification of arid lands http://www.ciesin.org/docs/002-193/002-193.html http://www.ciesin.org/docs/002-193/002-193.html