The Ghosts, and Other Lectures

Arrows of Freethought

Mistakes of Moses

The Works of Robert G. Ingersoll, Vol. 11 (of 12) Dresden Edition—Miscellany

The Freedom of Science

A Grammar of Freethought

Individuality From 'The Gods and Other Lectures'

The Mistakes of Jesus

The Works of Robert G. Ingersoll, Vol. 06 (of 12) Dresden Edition—Discussions

Heretics And Heresies From 'The Gods and Other Lectures'

Humboldt From 'The Gods and Other Lectures'