Columbia subject headings:
Enlightenment.
History--Philosophy.
Ley, Hermann, 1911-1990.
Science--Philosophy.
Harvard subject headings:
Atheism--History
Ley, Hermann, 1911-1990.
Science--Philosophy
Princeton subject headings:
Historians--20th century--Biography--Congresses.
Ley, Hermann, 1911-1990--Congresses.
Ley, Hermann, 1911-1990--Influence--Congresses.
Philosophers--20th century--Biography--Congresses.
Science--Philosophy--History--Congresses.