Historic Court Memoirs of France: An Index — Various
Index of Project Gutenberg Works on Black History / A 2019 Project Gutenberg Contribution for Black History Month — Various
Index of the PG Works of Voltaire in English — Voltaire
Index of the Project Gutenberg Works of Various Authors on Napoleon Bonaparte — Various
Index of the Project Gutenberg Works on Women's Suffrage / Four volumes edited by Elizabeth Cady Stanton, Susan B. Anthony, and Matilda Joslyn Gage — David Widger
Quotes and Images: An Index of the Project Gutenberg Collection of Quotes and Images — Various
The French Immortals: Quotes and Images, Complete — Various
The Project Gutenberg Collection of Works by Freethinkers / With Linked On-line and Off-line Indexes to 157 Volumes by 90 Authors; Plus Indexes to 15 other Author's Multi-Volume Sets. — Various
The Project Gutenberg Works of Plato: An Index — Plato
The Project Gutenberg Works of Xenophon: An Index — Xenophon
Widger's Quotations from Project Gutenberg Edition of French Immortals Series — David Widger
