Columbia subject headings:
Colombia--Commerce--Ecuador.
Drug control--Economic aspects--Colombia.
Drug control--Economic aspects--Ecuador.
Ecuador--Commerce--Colombia.
Political violence--Economic aspects--Colombia.
Harvard subject headings:
Colombia--Commerce--Ecuador.
Drug control--Economic aspects--Colombia.
Drug control--Economic aspects--Ecuador.
Ecuador--Commerce--Colombia.
Political violence--Economic aspects--Colombia.
Princeton subject headings:
Colombia--Commerce--Ecuador.
Drug control--Economic aspects--Colombia.
Drug control--Economic aspects--Ecuador.
Ecuador--Commerce--Colombia.
Political violence--Economic aspects--Colombia.