00369nam a2200145Ia 4500008004100000020001600041082001600057100001900073245001800092260005100110300000800161650001800169650001800187653001800205170901s1975    xx            000 0 und d  a063209740 X  a574.5bW43R  aWhitton, B. A. 0aRiver Ecology  aOxfordbBlackwell Scientific Publicationc1975  a725  aLife sciences  aPure Sciences  aRiver ecology