H.W. · Harold L. Willis · Harold W
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Foundations of Natural Farming | 978-1-60173-007-7 (1-60173-007-1) | 2008 | Ph.D. |
| How to Grow Great Alfalfa & Other Forages | 978-1-60173-003-9 (1-60173-003-9) | 2008 | |