L.D. · R.D. · R. L · Roy L. Donahue
| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Exploring Agriculture: An Introduction to Food and Agriculture | Hardcover | 978-0-13-295899-8 | 1984 | James E. Christiansen |
| Exploring agriculture: An introduction to food and agriculture | " | 978-0-13-295907-0 | 1979 | |
| Soils: An introduction to soils and plant growth | Paperback | 978-0-13-822288-8 | 1983 | |
| Soils: An introduction to soils and plant growth | Hardcover | 978-0-13-821918-5 | 1977 | |
| Soils;: An introduction to soils and plant growth | " | 978-0-13-821876-8 | 1971 | |