Columbia subject headings:
American newspapers--History--20th century.
American newspapers--Ownership--Political aspects--History--20th century.
Journalism--Objectivity--United States--History--20th century.
Press and politics--United States--History--20th century.
Press monopolies--United States--History--20th century.
Harvard subject headings:
American newspapers--History--20th century.
American newspapers--Ownership--Political aspects--History--20th century.
Journalism--Objectivity--United States--History--20th century.
Journalism--United States--Objectivity--History--20th century.
Press and politics--United States--History--20th century
Press monopolies--United States--History--20th century.
Princeton subject headings:
American newspapers--History--20th century.
American newspapers--Ownership--Political aspects--History--20th century.
Journalism--United States--Objectivity--History--20th century.
Press and politics--United States--History--20th century.
Press monopolies--United States--History--20th century.