000 00307nam a22001097a 4500
008 150908b xxu||||| |||| 00| 0 eng d
020 _a013503129 -X
082 _a574.526 3 AND
100 _aANDREWS, WILLIAM A.
245 _aINVESTIGATING AQUATIC ECOSYSTEMS.
260 _aPRENTICE - HALL CANADA;
_bONTARIO,
_c1981
999 _c2549
_d2549