Hänni, Henry

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Schmetzer, Karl; Krzemnicki, Michael; Hänni, Henry; Bernhardt, Heinz-Jürgen; Pettke, Thomas (2007). Gem-quality taaffeites and muscravites from Africa. Journal of gemmology, 30(7-8), pp. 367-382. London: Gemmological Association of Great Britain

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