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Variation of Birds in a State of Nature by Frank Russell, 1892

Variation of Birds in a State of Nature by Frank Russell, 1892, Page 67

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Nyctia nyctia I Diagram of lengths of culmen 50 specimens II Diagram of middle tors 50 specimens III Diagram of tarsi 50 specimens IV Diagram of tails 50 specimens V Diagram of wings 49 specimens VI Diagram of lengths 34 specimens
 
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