"Freshwater wetlands and sewage effluent disposal $Ann Arbor (mich.)" . . . . "Symposium on Freshwater Wetlands and Sewage Effluent Disposal (1976 : University of Michigan)" . . . "Freshwater wetlands and sewage effluent disposal : proceedings of a symposium held on May 10-11, 1976, at the University of Michigan, Ann Arbor"@en . . . . "Freshwater wetlands and sewage effluent disposal : proceedings of a symposium held on May 10-11, 1976 at the University of Michigan" . . . . . . . . . . . . . "Freshwater wetlands and sewage effluent disposal proceedings of a symposium held on May 10-11, 1976, at the University of Michigan, Ann Arbor"@en . . . "Conference papers and proceedings"@en . . . . . . . . . . "National symposium on freshwater wetlands and sewage effluent disposal" . "University of Michigan. Wetlands ecosystem research group." . .