000 00321nam a2200121Ia 4500
008 170324s9999 xx 000 0 und d
082 _a574.526
100 _a"Rigler, Frank H."
245 0 _aManual on methods for the assessment of secondary productivity in fresh waters
260 _c1900
365 _b0.00
942 _cBK
999 _c8647
_d8647