Columbia subject headings:
Harvard subject headings:
Limnology--Mexico--Periodicals.
Limnology--Periodicals.
Marine biology--Mexico--Periodicals.
Marine biology--Periodicals
Princeton subject headings:
Limnology--Mexico--Periodicals.
Limnology--Periodicals.
Marine biology--Mexico--Periodicals.
Marine biology--Periodicals.
Periodicals.