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- How to Know the Ducks, Geese and Swans of North America
How to Know the Ducks, Geese and Swans of North America
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Excerpt from How to Know the Ducks, Geese and Swans of North America: All the Species Being Grouped According to Size and Color
In preparing the Key, a large number of birds were examined and measured. In this connection, my thanks are due to Dr. J. A. Allen, of the American Museum of Natural History, and to Mr. Robert Ridgway, of the Smithsonian Institute, for the loan of many specimens for examination, and especially to Mr. William Brewster, for free access to his magnificent collection in Cambridge.
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