Columbia subject headings:
Harvard subject headings:
Caspian Sea--Environmental conditions--Bibliography--Periodicals.
Environmental sciences--Iran--Bibliography--Periodicals.
Gīlān (Iran : Province)--Environmental conditions--Bibliography--Periodicals.
Māzandarān (Iran)--Environmental conditions--Bibliography--Periodicals.
Princeton subject headings:
Caspian Sea--Bibliography--Periodicals.
Marine biology--Caspian Sea--Bibliography--Periodicals.