Rickert, David A. Methodology for river-quality assessment with application to the Willamette River Basin, Oregon - Arlington U.S. Geological Survey 1976 - vii, 55 Páginas il. 26 cm Inglés Subjects--Topical Terms: CALIDAD DEL AGUAEVALUACION Subjects--Geographic Terms: ESTADOS UNIDOS Dewey Class. No.: SENFOL0401