Columbia subject headings:
Water quality management--Ohio.
Water--Pollution--Ohio.
Harvard subject headings:
Acid pollution of rivers, lakes, etc.--Maumee River Watershed (Ind. and Ohio)
Maumee River Watershed (Ind. and Ohio)
Water quality management--Maumee River Watershed (Ind. and Ohio)
Water--Pollution--Maumee River Watershed (Ind. and Ohio)
Princeton subject headings: