Columbia subject headings:
Directories.
Museums--Canada--Directories.
Museums--North America--Directories.
Museums--United States--Directories.
Harvard subject headings:
Museums--Canada--Directories.
Museums--North America--Directories.
Museums--United States--Directories
Princeton subject headings:
Directories.
Museums--Canada--Directories.
Museums--North America--Directories.
Museums--United States--Directories.