00441aam a2200169   4500003000400000005001700004008004100021020001500062040000700077082001500084100002000099245004600119260004100165300001000206650002800216700002700244OSt20260625111113.0140223b1998    xxu||||| |||| 00| 0 eng d  a0521225078  c    a577.6  LEC  aCren, E. D. Le   aThe Functioning Of Freshwater Ecosystems   aLondon bCambridge University c1980  a588p.  a'Frewater Productivity   aMcConnell, R. H. Lowe