Columbia subject headings:
Harvard subject headings:
Authors and publishers--United States--History--20th century.
Books and reading--United States--History--20th century
Literature publishing--United States--History--20th century.
New American Library.
Paperbacks--Publishing--United States--History--20th century.
Popular literature--Publishing--United States--History--20th century.
Princeton subject headings:
Authors and publishers--United States--History--20th century.
Books and reading--United States--History--20th century.
Literature publishing--United States--History--20th century.
New American Library.
Paperbacks--Publishing--United States--History--20th century.
Popular literature--Publishing--United States--History--20th century.