- Works, Volume 2
- The Religion of Abraham Lincoln: Correspondence Between General Charles H. T. Collis and Colonel Robert G. Ingersoll
- Wit, Wisdom, Eloquence, and Great Speeches of Col. R. G. Ingersoll: Including Eloquent Extracts, Witty, Wise, Pungent, Truthful Sayings and Full Reports of the Great Speeches of This Celebrated Man, T
- Ingersoll To The Clergy: His Answers To Their Questions And Criticisms
- Take A Road Of Your Own, Or Individuality And Mental Freedom And Hell, Warm Words On The Cheerful And Comforting Doctrine Of Eternal Damnation