Columbia subject headings:
Boundaries--Social aspects--Colombia--Case studies.
Boundaries--Social aspects--Venezuela--Case studies.
Colombia--Boundaries--Venezuela--Case studies.
Venezuela--Boundaries--Colombia--Case studies.
Harvard subject headings:
Princeton subject headings:
Boundaries--Social aspects--Colombia--Case studies.
Boundaries--Social aspects--Venezuela--Case studies.
Case studies.
Colombia--Boundaries--Venezuela--Case studies.
Venezuela--Boundaries--Colombia--Case studies.