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3. Biddle, P.G. (1992) Patterns of Soil Drying and Moisture Deficit in the Vicinity of Trees on Clay Soils, DoE Research 1991–1992.
4. Binns, W.O. (1980) Trees and Water, Arboriculture Leaflet No. 6, Forestry Commission Research Station, Surrey, England, BRE Digest 240 (1993).
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