000 00254nam a2200097 4500
245 _aIntoduction to the soil ecosystem
_cB.N. Richards
100 _aRichards, B.N.
260 _aLondon
_bLongman
_c1974
300 _ax,266p.:ill.; 22cm.
082 _a574.526
_bRIC
999 _c25540
_d25540