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La revoca da parte del governo di buona parte delle concessioni per l'estrazione di ghiaia, sabbia e sassi (i cosiddetti "inerti") dai greti dei fiumi del Sopraceneri sta creando notevoli problemi all'edilizia ticinese, costringendo le imprese di costruzione a importare direttamente dall'Italia la materia prima per la realizzazione del calcestruzzo. "Prisma - Ghiaia come oro", 16.03.1973. Di Silvano Toppi. Commento audio e didascalie realizzati nel 2016 partendo dai testi originali.
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