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Rushton, Brian Stanley (1974) The Origin and Possible Significance of Variation of Leaf Structure in the Two Native British Oak Species, Quercus robur L. and Quercus petraea (Matt.) Liebl. PhD thesis, University of York.

Williams, Peter John (1974) Seasonal variations of plant nutrient levels and soil microorganisms in colliery spoil with particular reference to nitrogen. PhD thesis, University of York.

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