Columbia subject headings:
Electronic journals--Bibliography--Periodicals.
Internet addresses--Directories.
Learned institutions and societies--Directories.
Harvard subject headings:
Electronic discussion groups--Directories.
Electronic journals--Bibliography.
Internet addresses--Directories
Learned institutions and societies--Directories.
Periodicals.
Princeton subject headings:
Directories.
Electronic discussion groups--Directories.
Electronic journals--Bibliography--Periodicals.
Internet addresses--Directories.
Learned institutions and societies--Directories.
Periodicals.