Columbia subject headings:
Government publications--Library resources--Directories.
Libraries--Special collections--Government publications--Directories.
Libraries--United States--Special collections--Government publications--Directories.
Harvard subject headings:
Documents libraries--Canada--Directories.
Documents libraries--United States--Directories.
Foreign language publications--Canada--Library resources--Directories.
Foreign language publications--Library resources--Directories.
Foreign language publications--United States--Library resources--Directories.
Government publications--Canada--Library resources--Directories.
Government publications--Library resources--Directories.
Government publications--United States--Library resources--Directories.
Library resources--Canada--Directories.
Library resources--United States--Directories.
Special libraries--Canada--Directories.
Special libraries--United States--Directories.
Princeton subject headings:
Documents libraries--Canada--Directories.
Documents libraries--United States--Directories.
Foreign language publications--Library resources--Canada--Directories.
Foreign language publications--Library resources--United States--Directories.
Government publications--Library resources--Canada--Directories.
Government publications--Library resources--United States--Directories.