Bird leg scalation
W R Ogilvie Grant
<p>Trustees of the British Museum 1921. W R Ogilvie Grant
Guide to the gallery of birds 
<a rel="nofollow" class="external free" href="https://archive.org/details/guidetogalleryof00britrich.djvu">https://archive.org/details/guidetogalleryof00britrich.djvu</a>
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Part 1