Soil conservation policies: an assessment Based on material presented at the National Conference on Soil Consevation Policies, Washington. 15-16 November , 1979.
Soil conservation policies: an assessment Based on material presented at the National Conference on Soil Consevation Policies, Washington. 15-16 November , 1979.
- Ankeny USA): SCSA, 1979.
- 154 p.
Includes bibliographies
Conservação do solo
Politica agricola
Includes bibliographies
Conservação do solo
Politica agricola

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