Letters

01 August 1952
Comments Letters SIRS,--The Ibis for April 1953 will include a group of papers on Visible Migration (particularly in passerine birds) as observed in various countries. The newly-formed Sub-committee on Visible Migration of the British Trust for Ornithology (see below) fee...
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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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