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arrivals ATKINSON autumn migration Barnacle Geese Barnacle Goose Bean Goose Borkum Brent Goose British Isles Club CN CO T-H CN T-H CNCN count date counters December decrease EDWARD HINDLE Elbe Estuary Emsland Friesian Islands GEESE AND SWANS geographical area GOOSE IN N.W. graphs grass grey geese Grey Lag hard weather Helgoland individual waters International Wildfowl Research J. G. Harrison Jade Basin January large numbers Leicestershire LINCOLNSHIRE Mallard maps migration routes N.W. Europe N.W. Germany Natural History Society Netherlands North Sea coast number of waters observations occasional October Ornithologists peak period Peter Scott Pink-footed Geese population of wildfowl possible R. A. H. Coombes Regional Organizers regular counts reports return migration Road Schleswig-Holstein seen Severn small gaggles small numbers small skeins spring migration status of wildfowl Sylt T-H CN T-H T-H THAMES VALLEY totals Vogelwarte Waddenzee Weser Wildfowl Counts Wildfowl Inquiry Committee Wildfowl Research Institute winter visitor Zeeland Zostera