Columbia subject headings:
Harvard subject headings:
Irrigation farming--Environmental aspects--California--San Joaquin Valley.
San Joaquin Valley Drainage Program.
Water quality--California--San Joaquin Valley.
Water--Pollution--California--San Joaquin Valley.
Princeton subject headings:
Irrigation farming--Environmental aspects--California--San Joaquin Valley.
San Joaquin Valley Drainage Program.
Water quality--California--San Joaquin Valley.
Water--Pollution--California--San Joaquin Valley.