Columbia subject headings:
Censorship--Handbooks, manuals, etc.
Freedom of information--Handbooks, manuals, etc.
Libraries--Censorship--Handbooks, manuals, etc.
Harvard subject headings:
Censorship--Handbooks, manuals, etc.
Freedom of information--Handbooks, manuals, etc.
Libraries--Censorship--Handbooks, manuals, etc.
Princeton subject headings: