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Bird Spotting series
This page lists the books in the Bird Spotting series published by Blandford in the 1960's. The books are listed by publication date with oldest at the top.
From the inside cover: "This 'Bird Spotting' series is recommended by the Royal Society for the Protection of Birds as a general introduction to bird identification, especially suitable for young persons."
Note that there is a multi-volume series of six volumes and a single volume that appears to be a 'collected' version. All appear to have been reissued a number of times. I have not yet worked out the publishing history so there may be mistakes relating to publication dates and cover images.