- Listenly
- Public Library
- Project Gutenberg
- Fertilizers
Fertilizers — Audiobooks
Crops and Methods for Soil Improvement
by Alva Agee
Manures and the principles of manuring
by Charles Morton Aikman
Peat and its Uses as Fertilizer and Fuel
by Samuel W. (Samuel William) Johnson
Talks on Manures
by Joseph Harris
The Farm That Won't Wear Out
by Cyril G. (Cyril George) Hopkins