অনুরূপ উপাদানগুলি: Land evaluation for land-use planning and conservation in sloping areas :
- Quantitative and numerical methods in soil classification and survey /
- Soil conservation /
- Soil conservation /
- Soil conservation : an international study
- Conservation du sol et de leau = soil and water conservation /
- Utilization, treatment, and disposal of waste on land : proceedings of a workshop held in Chicago, IL, 6-7 Dec. 1985 /