00480naa a2200133 a 450000100080000000500110000800800410001910000220006024500480008226000090013070000220013970000230016177301620018413382982004-10-28       2004    bl uuuu     u00u1 u    #d1 aRAMALHO FILHO, A.  aWhat have we done against land degradation?  c20041 aFREITAS, P. L. de1 aCLAESSEN, M. E. C.  tIn: FAZ, A.; ORTIZ, R.; GARCIA, G. (Ed.). Invited lectures and abstracts: fourth International Conference on Land Degradation. [s.l.]: ICLD4, 2004. p. 53-67.