Columbia subject headings:
Education, Higher--United States--Directories.
Educom--Directories.
Harvard subject headings:
Education, Higher--United States--Data processing--Directories.
Educom--Directories.
High technology industries--United States--Directories.
Princeton subject headings:
Corporations--United States--Directories.
Directories.
Education, Higher--United States--Directories.
Educom--Directories.