The existence of an overland migration route across the South Midlands of England, during the autumn months. Observations made in the autumn of 1948 within a few miles of the Cotswold Hills led to the discovery of such a route running in a south-westerly direction across Preston-on-Stour, near Stratford-on-Avon. Further and more intensive study in 1949 led to the addition of several new speci
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