5 of 5 people found the following review helpful
As much information on bird species as possible,
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This review is from: Handbook of the Birds of Europe, the Middle East and North Africa. The Birds of the Western Palearctic Vol 9: Buntings and New World Warblers.: Buntings and New World Warblers Vol 9 (Hardcover)
An excellent final volume to the series - as the volumes have been produced each has tended to be larger than the last as the amount of available bird research has continued to grow over the years. I tend to use these volumes as a base and then update with Google Scholar - overall gives me a good background to the birds I see in the UK.