Columbia subject headings:
American periodicals--Directories.
Associations, institutions, etc.--United States--Periodicals--Directories.
Nonprofit organizations--United States--Periodicals--Directories.
Harvard subject headings:
American periodicals--Directories.
Associations, institutions, etc.--United States--Periodicals--Directories.
Nonprofit organizations--United States--Periodicals--Directories.
Periodicals.
Princeton subject headings:
Associations, institutions, etc.--United States--Periodicals--Directories.
Directories.