"male" . "1975"^^ . . . "2013-08-07"^^ . "Gold mining in Ghana / William Tsuma, 2010. - . - Deutsche Nationalbibliothek. - https://portal.d-nb.de. - 2011-04-20"@fr . . . . . "William Tsuma" . "2011-03-17" . "0000000118719396" . . "Tsuma" . "2013-08-08" . . . . "16274211"^^ . . . . . "William" . . . "VIAF" . . . "William Tsuma"@fr .