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„Hydrology of soil types”(PDF). Cranfield University, National Soil Resources Institute. Архивирано(PDF) из оригинала 18. 3. 2016. г. Приступљено 6. 1. 2019.
„Hydrology of soil types”(PDF). Cranfield University, National Soil Resources Institute. Архивирано(PDF) из оригинала 18. 3. 2016. г. Приступљено 6. 1. 2019.