BTO Guide 24 1993
From the Foreword:
"This work is primarily designed to aid ringers working in the field to identify species, and in some cases subspecies, and to determine the age, and sex of birds in the hand. It will,no doubt,also prove usefull to museum workers studying skins and,because non-passerine species more often exihibit manifestly different plumage traits between ages than do passerines, it will also be used by expert field ornithogists"
Except from tiny shelff wear, this book is like new.