Columbia subject headings:
Harvard subject headings:
American newspapers--Directories
American periodicals--Directories
Broadcasting--Canada--Directories.
Broadcasting--United States--Directories.
Canadian newspapers--Directories
Canadian periodicals--Directories
Newspapers
Periodicals
Princeton subject headings:
American newspapers--Directories.
American periodicals--Directories.
Canadian newspapers--Directories.
Canadian periodicals--Directories.
Directories.
Radio broadcasting--Canada--Directories.
Radio broadcasting--United States--Directories.
Television broadcasting--Canada--Directories.
Television broadcasting--United States--Directories.