| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Proceedings of the 7th Conference of the International Soil Tillage Research Organization, ISTRO, in Uppsala, Sweden 1976-06-15--18 | 978-91-7O88-5O2-O (91-7O88-5O2-8) | 1976 |
I.R. · International R · S R · S. T. · T. R.