WINTER CENSUS 6(3)second, for comparison with any possible future studies in similar areas, like the Humber or Thames Estuaries.We should also be most grateful for any constructive criticism of the methods used, based on practical experience in this type of work. ACKNOWLEDGEMENTSWe owe a particular debt of gratitude to Dr. I. C. T. Nisbet, who first conceived the idea of a Wash census and who has throughout given us much encouragement and the benefit of his wide knowledge of the area.We also wish to thank Mr. and Mrs.
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R. S. George (1959) studied this question.