Columbia subject headings:
Harvard subject headings:
Bloch, Ernst, 1885-1977
Heidegger, Martin, 1889-1976
Philosophy, Modern--20th century.
Technology and civilization
Princeton subject headings:
Bloch, Ernst, 1885-1977.
Heidegger, Martin, 1889-1976.
Philosophy, Modern--20th century.
Technology and civilization.