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Wetmore, Alexander, 1886-, et al. / Warm-blooded vertebrates
(1931)

Chapter II: adaptations for progression by flying ,   pp. 13-24 ff. PDF (4.7 MB)



PLATE 8
The structure of feathers: Left, barbs and barbules in contour feather of
canary, enlarged I30 times;
right, barbicels and hamuli of golden eagle, enlarged 5oo times. After J.
S. Gladstone


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