Columbia subject headings:
Canada--Boundaries--United States.
Northwest boundary of the United States.
United States--Boundaries--Canada.
Harvard subject headings:
Canada--Boundaries--United States.
Georgia, Strait of (B.C. and Wash.)
Haro Strait (B.C. and Wash.)
Juan de Fuca, Strait of (B.C. and Wash.)
Northwest boundary of the United States.
Pacific Ocean.
Point Roberts (Wash.)
United States--Boundaries--Canada.
Princeton subject headings:
Canada--Boundaries--United States.
Northwest boundary of the United States.
United States--Boundaries--Canada.