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The gods and other lectures (New York : D. M. Bennett, 1876)

Some mistakes of Moses (Washington, D.C. : C. P. Farrell, 1879)

Walt Whitman (New York, The Truth Seeker Co, 1890)

Col. Ingersoll's reply to his critics in the N.Y. "Evening Telegram."  (Toronto : J. Spencer Ellis, 1892)

Shakespeare, a lecture (New York, Farrell, 1895)

Abraham Lincoln, a lecture  (New York, Farrell, 1895)

Voltaire, a lecture (New York, Farrell, 1895)

Great speeches of Col. R. G. Ingersoll; complete (Chicago : Rhodes & McClure, 1895)

"Why I am an agnostic" (1896)

The works of Robert G. Ingersoll vols. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 (New York : The Dresden pub. co., C. P. Farrell, 1902)