Letters

01 June 1991 Comments Letters Keeping warm. In his useful 'Birdcraft' article on clothing for birdwatchers (Brit. Birds 84: 27-30), Dr M. A. Ogilvie could have given one more useful tip of which a surprisingly large number of birdwatchers are apparently unaware. Most farmworkers, e...
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Letters

01 May 1952 Comments Letters --The increasing use of various types of colour-marking for the field recognition of birds must lead to confusion between individual experiments unless an authoritative central register can be compiled. The Scientific Advisory Committee of the British Tru...
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