Kioo : Tofauti kati ya masahihisho

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Mstari 21:
* [http://1st.glassman.com/articles/glasscolouring.html Substances used in the Making of Colored Glass]
* [http://www.glassfacts.info Almost 400 articles and images about glass (mostly art glass)]
* [http://www.pfwc.co.uk/cloths-use-cleaning-glass-windows/ Cloths to use for cleaning glass and windows]
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