|
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 |
|
|
7 |
A practical manual of soil microbiology laboratory methods, 1967 |
1967 |
Report |
|
|
6 |
Aerial photo interpretation in soil survey, 1967 |
1967 |
Report |
|
|
|