Columbia subject headings:
Alaska--Boundaries--Canada.
Canada--Boundaries--Alaska.
Surveying--Alaska--History.
Surveying--British Columbia--History.
Surveying--Yukon--History.
Harvard subject headings:
Alaska--Boundaries--Canada.
Canada--Boundaries--Alaska.
Surveying--Alaska--History.
Surveying--British Columbia--History.
Surveying--Yukon Territory--History.
Surveying--Yukon--History.
Princeton subject headings:
Alaska--Boundaries--Canada.
Canada--Boundaries--Alaska.
Surveying--Alaska--History.
Surveying--British Columbia--History.
Surveying--Yukon Territory--History.