Columbia subject headings:
Stream measurements--North Dakota--Statistics--Periodicals.
Water quality--North Dakota--Statistics--Periodicals.
Water resources development--North Dakota--Statistics--Periodicals.
Harvard subject headings:
Princeton subject headings:
Periodicals.
Statistics.
Stream measurements--North Dakota--Statistics--Periodicals.
Water quality--North Dakota--Statistics--Periodicals.
Water resources development--North Dakota--Statistics--Periodicals.