Letters

01 February 1977 Comments Letters Photographic quality and usefulness While browsing through a dozen recent volumes of the Swedish journal Vår Fågelvårld, I was impressed by the high proportion of photographs depicting birds in flight, even though not all of them were of very good q...
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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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