Columbia subject headings:
Grazing--West (U.S.)
Riparian ecology--West (U.S.)
Water--Pollution--West (U.S.)
Wetland ecology--West (U.S.)
Harvard subject headings:
Grazing--West (U.S.)
Riparian ecology--West (U.S.)
Water--Pollution--West (U.S.)
Wetland ecology--West (U.S.)
Princeton subject headings: