Columbia subject headings:
Science--Periodicals--Directories.
Harvard subject headings:
Health--Periodicals--Directories.
Medicine--Periodicals--Directories.
Research--Periodicals--Directories.
Science--Periodicals--Directories.
Princeton subject headings:
Health--Periodicals--Directories.
Medicine--Periodicals--Directories.
Research--Periodicals--Directories.
Science--Periodicals--Directories.