00721nam a2200169 a 450000500170000000800410001703500150005811100680007324501700014126000650031130000100037644000280038650000150041465000330042965000290046271000600049120260818145052.0                                          a.b115106382 aSymposium on Save the Lakesd(1969 :cDetroit Lakes, Minnesota)10aLake eutrophicationb- water pollution causes, effects and control ; papers presented at the "Save the Lakes symposium", August 18-19, 1969, Detroit Lakes, Minnesota  aMinneapolis, Minn. :bWater Resources Research Center,c1970  a61 p. 0aWRRC bulletin ;vno. 22  aPB 196 47910aWaterxPollutionxCongresses10aDetroit Lakes, Minnesota10aMinnesota.bUniversity. Water Resources Research Center