- Listenly
- Public Library
- Project Gutenberg
- Handbooks, vade-mecums, etc.
Handbooks, vade-mecums, etc. — Audiobooks
Enquire Within Upon Everything
by Robert Kemp Philp
Barkham Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889
by Barkham Burroughs
One Thousand Secrets of Wise and Rich Men Revealed
by C. A. Bogardus