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Supertopics:
Sand Depletion
Cement and Concrete

even sand is being overused      web

webhttp://www.spiegel.de/international/world/global-sand-stocks-disappear-as-it-becomes-highly-sought-resource-a-994851.html
authorLaura Höflinger
publicationDer Speigel
date2014-10-02

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