Columbia subject headings:
Special Libraries Association--Directories.
Special librarians--Canada--Directories.
Special librarians--United States--Directories.
Harvard subject headings:
Special Libraries Association--Directories.
Special librarians--Canada--Directories.
Special librarians--United States--Directories.
Princeton subject headings:
Special Libraries Association--Directories.
Special librarians--Canada--Directories.
Special librarians--United States--Directories.