Morgan, R. P. C. (1995). Soil erosion and conservation. London: Longman.
Trích dẫn kiểu ChicagoMorgan, Royston Philip Charles. Soil Erosion and Conservation. London: Longman, 1995.
Deismireacht MLAMorgan, Royston Philip Charles. Soil Erosion and Conservation. London: Longman, 1995.
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