Columbia subject headings:
Harvard subject headings:
CD-ROM industry--Directories.
CD-ROM publishing--Directories.
Compact discs--Catalogs--Directories.
Multimedia systems industry--Directories.
Multimedia systems industry--Equipment and supplies--Directories.
Multimedia systems--Directories.
Princeton subject headings:
CD-ROM industry--Directories.
CD-ROM publishing--Directories.
Compact discs--Catalogs--Directories.
Multimedia systems industry--Directories.
Multimedia systems industry--Equipment and supplies--Directories.
Multimedia systems--Directories.