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C. H. S. Watts, The Foods Eaten by Wood Mice (Apodemus sylvaticus) and Bank Voles (Clethrionomys glareolus) in Wytham Woods, Berkshire, Journal of Animal Ecology, Vol. 37, No. 1 (Feb., 1968), pp. 25-41
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C. H. S. Watts (1968) studied this question.
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