Letters

01 June 2003 Comments Letters In October 2000, the Department for the Environment, Transport and the Regions (DETR) commissioned a consortium (consisting of the BTO, the RSPB/Oxford University Farmland Bird Group, the Central Science Laboratory (CSL) and WildWings Bird Management) ...
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Letters

01 June 1969 Comments Letters Bill-length as a field-character of the White-winged Black Tern ? In his paper on 'Juvenile and winter plumages of the marsh terns' (Brit. Birds, 53: 243-252) Kenneth Williamson differentiated without qualification between the bill of the Black Tern Chlid...
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