Concept
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The Market Revolution
Eli Whitney on U.S. postage issue of 1940
Eli Whitney's crucial contributions to the Market Revolution created a lasting legacy.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Eli Whitney 1940 Issue-1c."
http://en.wikipedia.org/wiki/File:Eli_Whitney_1940_Issue-1c.jpg
Wikipedia
Public domain.