Columbia subject headings:
Books and reading--United States--History.
Censorship--United States--History.
Freedom of information--United States--History.
Library science--United States--History.
Public libraries--Censorship--United States--History.
Harvard subject headings:
Books and reading--United States--History.
Censorship--United States--History.
Freedom of information--United States--History.
Library science--United States--History.
Public libraries--Censorship--United States--History.
Princeton subject headings:
Books and reading--United States--History.
Censorship--United States--History.
Freedom of information--United States--History.
Library science--United States--History.
Public libraries--United States--Censorship--History.