Columbia subject headings:
Geology, Stratigraphic--Quaternary--Maps.
Geology--Manitoba--Winnipeg, Lake--Maps.
Geology--North Dakota--Maps.
Maps.
Harvard subject headings:
Geology, Stratigraphic--Quaternary--Maps
Geology--Manitoba--Winnipeg, Lake--Maps.
Geology--North Dakota--Maps.
North Dakota--Maps.
Winnipeg, Lake (Man.)--Maps.
Princeton subject headings: