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Perhaps the Library's most prized possession is its collection of John James Audubon's "Birds of America" prints. These hand-colored lithographs printed in the 1830's by Robert Havell from the engravings of Audubon's drawings are artistically and historically significant - - Audubon's detailed portraits of North American birds represented the first time that drawings of birds were portrayed in their natural environment. The Library's 430 individual prints, representing nearly the complete set of 435 total prints, recently underwent a comprehensive two-year restoration process through the professional services of the Conservation Center for Art and Historic Artifacts in Philadelphia. Thus, these rare pieces---only 120 sets are in existence today - - have the finest appearance possible. In a custom-built display case in the Library's main reference area one or two individual prints on a rotating basis. Interested visitors may call to arrange an appointment to inspect other prints not currently on public display.