Columbia subject headings:
Harvard subject headings:
College teachers--In-service training--Minnesota--Case studies.
College teachers--In-service training--North Dakota--Case studies.
College teachers--In-service training--South Dakota--Case studies.
Princeton subject headings:
College teachers--In-service training--Minnesota--Case studies.
College teachers--In-service training--North Dakota--Case studies.
College teachers--In-service training--South Dakota--Case studies.