Limnology of the Iowa reach of the Mississippi River.
D002617:Chemical Industry / Q000592:standards; D006088:Gram-Negative Aerobic Bacteria / Q000302:isolation & purification; D007448:Invertebrates / Q000302:isolation & purification; D007484:Iowa; D009111:Local Government; D010100:Oxygen; D012722:Sewage; D014871:Water Microbiology; D014876:Water Pollution / Q000032:analysis*; D014877:Water Pollution, Chemical
D012722:Sewage; D010100:Oxygen