Columbia subject headings:
Biology--Periodicals.
Earth sciences--Periodicals.
Mineralogy--Periodicals.
Science.
Harvard subject headings:
Biology--Periodicals
Earth sciences--Periodicals
Mineralogy--Periodicals
Science--Periodicals
Princeton subject headings:
Biology--Periodicals.
Earth sciences--Periodicals.
Mineralogy--Periodicals.
Periodicals.
Science.