| http://www.w3.org/ns/prov#value | - and complying with new federal restrictions, stopped the use of flame-retardant asbestos midway through construction of the north tower.Asbestos, which had been used to fireproof buildings for generations before being effectively banned by the federal government, is a carcinogen that can lead to illnesses such as mesothelioma, asbestosis and other diseases.???High concentrations of many useful sub
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