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Platinum - Wikipedia
The History of Platinum | Education - The Natural Sapphire …
Antonio de Ulloa: the Discoverer of Platinum? - OpenMind
The Incredible Story of How Platinum Was Discovered - YouTube
Tom Gores - Wikipedia
Platinum | Color, Symbol, Uses, & Facts | Britannica
Platinum | History, Uses, Facts, Physical & Chemical Characteristics
WebElements Periodic Table » Platinum » historical information
A History of Platinum and its Allied Metals - Google Books