Columbia subject headings:
Advertisers--United States--Directories.
Corporations--United States--Directories.
Holding companies--United States--Directories.
Harvard subject headings:
Advertisers--United States--Directories.
Corporations--United States--Directories
Holding companies--United States--Directories.
Princeton subject headings:
Corporations--United States--Directories.
Directories.
Holding companies--United States--Directories.