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Bibliography
national museum of America history. (N.d.) invention at play. http://www.inventionatplay.org/inventors_spe.html
Mary bellis.(2014) the cotton gin and Eli Whitney. http://inventors.about.com/od/cstartinventions/a/cotton_gin.htm
About.com inventions. (2014) karl benz.
http://inventors.about.com/library/inventors/blbenz.h
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