Вештачка гума — разлика између измена
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== Литература ==
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* {{Cite book |ref= harv|last=Slack|first=Charles|title=Noble Obsession: Charles Goodyear, Thomas Hancock, and the Race to Unlock the Greatest Industrial Secret of the 19th Century|url=http://books.google.com/books?id=XuUjgUaZzOAC|year=2003|publisher=Hyperion Books|isbn=978-0-7868-8856-6
* -{Neal Ascherson, ''The King Incorporated'', Allen & Unwin, 1963. ISBN 1-86207-290-6 (''1999 Granta edition'').}-
* -{Adam Hochschild, ''King Leopold’s Ghost: A Story of Greed, Terror, and Heroism in Colonial Africa'', Mariner Books, 1998. ISBN 0-330-49233-0.}-
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