Columbia subject headings:
Wages--Clerks--Canada--Directories.
Wages--Clerks--United States--Directories.
Harvard subject headings:
Wages--Clerks--Canada--Directories.
Wages--Clerks--Canada--Statistics--Periodicals.
Wages--Clerks--United States--Directories.
Wages--Clerks--United States--Statistics--Periodicals.
Wages--Electronic data processing personnel--Canada--Directories.
Wages--Electronic data processing personnel--United States--Directories.
Princeton subject headings: