Columbia subject headings:
Harvard subject headings:
Greenberg, Clement, 1909-1994
Heidegger, Martin, 1889-1976
McLuhan, Marshall, 1911-1980
Philosophy, Modern--20th century.
Princeton subject headings:
Flusser, Vilém, 1920-1991. Rückschlag der Werkzeuge auf das Bewusstsein.
Greenberg, Clement, 1909-1994.
Heidegger, Martin, 1889-1976.
Language and languages--Philosophy--History--20th century.
McLuhan, Marshall, 1911-1980.
Phenomenology--History--20th century