00431    a2200157   4500020001500000082001900015100001800034245004700052260003400099300002200133440002900155650002100184700002100205700002300226700002400249  a084937443X  a333.73137bMET  aLal, R. eed.  aMethods for assessment of soil degradation  aLondonbCRS Pressc1998g1998  a[16], 558p.c23cm  aAdvances in soil science  aSoil degradation  aBlum, W.H. eed.  aStewart, B.A eed.  aValentine, C. eed.