Andy Adcock
Worst person on Birdforum
May prove popular, especially with ringers but it's pricey for a paperback.
https://www.wildsounds.com/products/6426-Ageing-and-Sexing-of-Migratory-East-Asian-Passerines.shtml
https://www.wildsounds.com/products/6426-Ageing-and-Sexing-of-Migratory-East-Asian-Passerines.shtml
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