Columbia subject headings:
Drug control--Bolivia.
Drug control--Colombia.
Drug control--Peru.
Drug traffic--Bolivia.
Drug traffic--Colombia.
Drug traffic--Peru.
Harvard subject headings:
Princeton subject headings:
Drug control--Bolivia.
Drug control--Colombia.
Drug control--Peru.
Drug traffic--Bolivia.
Drug traffic--Colombia.
Drug traffic--Government policy--Bolivia.
Drug traffic--Government policy--Colombia.
Drug traffic--Government policy--Peru.
Drug traffic--Peru.