Columbia subject headings:
Librarians--Professional ethics--United States--History--20th century.
Libraries and society--United States--History--20th century.
Library science--Political aspects--United States--History--20th century.
Library science--Social aspects--United States--History--20th century.
Harvard subject headings:
Librarians--Professional ethics--United States--History--20th century.
Libraries and society--United States--History--20th century.
Library science--Moral and ethical aspects--United States--History--20th century.
Library science--Political aspects--United States--History--20th century.
Library science--Social aspects--United States--History--20th century.
Princeton subject headings:
Librarians--Professional ethics--United States--History--20th century.
Libraries and society--United States--History--20th century.
Library science--Political aspects--United States--History--20th century.
Library science--Social aspects--United States--History--20th century.