Columbia subject headings:
Harvard subject headings:
Environmental policy--Asia, Central
Environmental policy--Caucasus.
Environmental policy--Europe, Eastern
Environmental protection--Asia, Central.
Environmental protection--Caucasus.
Environmental protection--Europe, Eastern
Princeton subject headings:
Environmental policy--Asia, Central.
Environmental policy--Caucasus.
Environmental policy--Europe, Eastern.
Environmental protection--Asia, Central.
Environmental protection--Caucasus.
Environmental protection--Europe, Eastern.