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VERY GOOD SOFTBACK COPY. VOLUME 2: GULLS TO DIPPERS. AN ADVANCED FIELD HANDBOOK TO THE BIRDS OF NORTH AMERICA. TEXT BY 61 KEY EXPERTS WITH THEIR PERSONAL SECRETS FOR IDENTIFYING PARTICULAR SPECIES. HUNDREDS OF COLOUR PHOTOGRAPHS AND PAINTINGS. THE FIRST GUIDE BASED ON THE NEW CLASSIFICATION OF THE AMERICAN ORNITHOLOGISTS` UNION. FOURTH PRINTING.