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The Spirit of Invention
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Minnesota State University, Mankato
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Sources
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Online
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Innovative Ideas Moving Us Forward
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San Antonio Public Library, TX
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Online
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U.S. Copyright Office
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San Antonio Public Library, TX
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Online
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| Pirates of the 21st Century: Copyright & You | Grinnell College,IA | Images | Sources | Online |
| Patents of Oklahoma Women Inventors 1891 - 1907 | Oklahoma State University, OK | Images | Sources | Online |