Immediate intuition in the new rationalism of Albert Schweitzer
Age of reason;: Being an investigation of time and fabulous theology
The emancipation of modern life and letters: How the world of today is rejecting supernaturalism and turning to the rule of reason (ABC library of living knowledge)
Progress and chaos: Modernization and rediscovery of religion and authority
The age of unreason: Being a reply to Thomas Paine, Robert Ingersoll, Felix Adler, Rev. O.B. Frothingham, and other American rationalists
Root-principles in rational and spiritual things
The narrative of the fire of London: Freely handled on the principles of modern rationalism
Permanence and change;: An anatomy of purpose, (The New republic series)
Selected works of Voltaire (R.P.A. cheap reprints)
The creed of the rational puritans ; a code of two tables containing the general principles of wisdom and morality