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| | Progress Made Visible: American World's Fairs and Expositions |
 | | Philadelphia: Published for the Centennial Catalogue Company by J. Nagle, 1876. |
 | | Everything at the Centennial was classified by department (Mining and Metallurgy, Manufactures, Education and Science, Art, Machinery, Agriculture, and Horticulture), subclassified, and further subclassified in a logical scheme that later became a model for the Dewey Decimal System. |
 | | The 1776 Philadelphia Centennial Exposition, the first exposition of its kind in the United States, was held to mark the 100th anniversary of the Declaration of Independence. |
| www.lib.udel.edu /ud/spec/exhibits/fairs/cent.htm (655 words) |
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