Columbia subject headings:
Environmental protection--Slovenia--Ljubljana Region.
Factory and trade waste--Slovenia--Ljubljana Region.
Pollution--Slovenia--Ljubljana Region.
Harvard subject headings:
Environmental protection--Slovenia--Ljubljana Region.
Factory and trade waste--Slovenia--Ljubljana Region.
Pollution--Slovenia--Ljubljana Region.
Princeton subject headings:
Environmental protection--Slovenia--Ljubljana Region.
Factory and trade waste--Slovenia--Ljubljana Region.
Pollution--Slovenia--Ljubljana Region.