00262nam a22001097a 4500003000400000008004100004082001600045100001600061245004700077260002000124300000800144OSt240116b        |||||||| |||| 00| 0 eng d  a574.5bC27E  aChawick,MJ.  aEcology of resource degradations $ renewal  aBlackwellc1975  a480