Primary Sources
The Dresden Edition
Ingersoll's complete works in twelve volumes (1900–1902), in the public domain and freely readable.
Further Reading
Resources
A curated directory for those who want to read more — about Ingersoll, his contemporaries, and the world he lived in.
Biography
Scholarly Biographies
The best published biographies of Ingersoll.
- American Infidel: Robert G. Ingersoll — Orvin Larson (1962)
- The Great Agnostic: Robert Ingersoll and American Freethought — Susan Jacoby (2013)
- Freethinkers: A History of American Secularism — Susan Jacoby (2004)
- The Life of Robert G. Ingersoll — Herman E. Kittredge (1911)
Digital Archives
Online Archives
Other reputable digital sources.
Historical Societies
Museums & Societies
Places that preserve Ingersoll's memory and legacy.
Reference
Background Reading
Essential context on the Gilded Age and American freethought.
- Democracy in America — Alexis de Tocqueville
- The Age of Reason — Thomas Paine
- Leaves of Grass — Walt Whitman
- The Gilded Age — Mark Twain & Charles Dudley Warner
Related Fields
Philosophy & History
For readers pursuing the wider tradition.
- William James — The Varieties of Religious Experience
- Bertrand Russell — Why I Am Not a Christian
- Susan Jacoby — The Age of American Unreason
- Martin E. Marty — Modern American Religion
Know a resource we should add? Let us know.