000 00308nam a2200121Ia 4500
008 170101s1987 xx 000 0 und d
082 _a333.72 LAL
100 _aLal J.B.
245 0 _aEnvironment Conservation
260 _aDehra Dun
_bInternational Book Dist.
_c1987
300 _a111p.
942 _2ddc
_cB
999 _c1021066
_d1021066