Columbia subject headings:
Canada--Politics and government--Handbooks, manuals, etc.
Professional associations--Canada--Directories.
Professional associations--United States--Directories.
Public administration--Canada--Societies, etc.--Directories.
Public administration--United States--Societies, etc.--Directories.
Social service--Bibliography--Periodicals.
Social service--Directories.
United States--Politics and government--Handbooks, manuals, etc.
Harvard subject headings:
Social service--Directories.
Princeton subject headings:
Directories.
Public administration--Canada--Societies, etc.--Directories.
Public administration--United States--Societies, etc.--Directories.