Editors. "Diamonds discovered in Orange Free State". The Literary Encyclopedia. First published 30 December 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=18591, accessed 26 April 2015.]
Diamonds are discovered in the Orange Free State, an independent Boer republic in what is now South Africa.
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