Columbia subject headings:
Historiography--History--20th century.
History--Philosophy--History--20th century.
Philosophy, American--20th century.
Harvard subject headings:
Historiography--History--20th century
History--Philosophy--History--20th century
Philosophy, American--20th century.
Princeton subject headings:
Historiography--History--20th century.
History--Philosophy--History--20th century.
Philosophy, American--20th century.