| |
| 17 |
Trace elements in soils and agriculture, 1972 |
1972 |
Report |
|
|
| 16 |
Effects of intensive fertilizer use on the human environment, 1972 |
1972 |
Report |
|
|
| 15 |
Legislative principles of soil conservation, 1971 |
1971 |
Report |
|
|
| 14 |
Improving soil fertility in Africa, 1971 |
1971 |
Report |
|
|
| 13 |
Land degradation, 1971 |
1971 |
Report |
|
|
| 12 |
The response of wheat to fertilizers, 1971 |
1971 |
Report |
|
|
| 11 |
Soil fertility investigations on farmers? fields, 1970 |
1970 |
Report |
|
|
| 10 |
Physical and chemical methods of soil and water analysis, 1970 |
1970 |
Report |
|
|
| 9 |
The preparation of soil survey reports, 1970 |
1970 |
Report |
|
|
| 8 |
Soil survey interpretation and its use, 1967 |
1967 |
Report |
|
|
|
