On the structure of the beak and its muscles in the crossbill (Loxia curvirostra) / by William Yarrell.

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On the structure of the beak and its muscles in the crossbill (Loxia curvirostra) / by William Yarrell. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.