Columbia subject headings:
Cartography--Venezuela--History.
Guyana--Boundaries--Venezuela.
Venezuela--Boundaries--Guyana.
Harvard subject headings:
Cartography--Venezuela--History.
Guyana--Boundaries--Venezuela.
Venezuela--Boundaries--Guyana.
Princeton subject headings:
Guyana--Boundaries--Venezuela--History--Sources.
Venezuela--Boundaries--Guyana--History--Sources.