Columbia subject headings:
Czechs--Canada--Directories.
Czechs--United States--Directories.
Educators--Canada--Directories.
Educators--United States--Directories.
Harvard subject headings:
Czech Americans--Directories.
Czechs--Canada--Directories.
Slovak Americans--Directories.
Slovaks--Canada--Directories.
Teachers--Canada--Directories.
Teachers--United States--Directories.
Princeton subject headings: