Natural History Museum 'Treasures'

By Farah Nayeri - 2012-11-28T19:41:18Z

Natural History Museum via Bloomberg

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'Birds of America' Carolina Parakeets

A page from the first edition of John James Audubon's "Birds of America," the world's most expensive book. A copy of the book sold for $7.9 million at Christie's New York in January 2012. This page shows a group of Carolina parakeets.