Abraham Lincoln
Great Speeches of Col. R. G. Ingersoll
Some Mistakes of Moses
The Gods
The Gods and Other Lectures
The Works of Robert G. Ingersoll, Vol. II (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. I (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. IX (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. IV (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. III (in 12 volumes)
The Works of Robert G. Ingersoll Volume I: Lectures
The Works of Robert G. Ingersoll Volume II: Lectures
The Works of Robert G. Ingersoll, Vol. VIII (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. VII (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. VI (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. V (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. XII (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. XI (in 12 volumes)
The Works of Robert G. Ingersoll, Vol. X (in 12 volumes)
Voltaire