Columbia subject headings:
Guyana--Boundaries--Venezuela.
Venezuela--Boundaries--Guyana.
Harvard subject headings:
Berbice--Boundaries--Venezuela.
Guyana--Boundaries--Venezuela.
Venezuela--Boundaries--Guyana--Berbice.
Venezuela--Boundaries--Guyana.
Princeton subject headings:
Guyana--Boundaries--Venezuela.
Venezuela--Boundaries--Guyana.