Politics
The integral nationalism in France: Charles Maurras and the Action Française, 1931. Studies in Fascism: Ideology and Practice, American Mathematical Society Press, 1936, 175 p. The Rise and Decline of Marxism, Oates & Washbourne, 1938, 184 p.
Bolshevism: An Introduction to Soviet Communism, University of Notre Dame Press, 1952.