Não informado. Soil management abstracts. International Board for Soil Research and Management.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Soil Management Abstracts. Bangkok: International Board for Soil Research and Management.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Soil Management Abstracts. International Board for Soil Research and Management.
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