Letters

01 May 1999
Comments Letters THE COMMERCIALISATION OF ORNITHOLOGY It seems strange that a seven-line suggestion by Ian Moorhouse (Brit. Birds 91: 330) that an increase in the average age of observers might help to explain a decline in the numbers of some common birds should be con...
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Letters

01 November 1984
Comments Letters Recommended letter-code abbreviations for British birds. For over 20 years, members of the BTO have been using letter-codes to register birds seen on Common Birds Census visits. Various additions to the list of codes have been made over the years, nota...
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