<http://webisa.webdatacommons.org/262501750>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/267888245>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/262501750> .
<http://webisa.webdatacommons.org/prov/144985735>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/262501750> .
<http://webisa.webdatacommons.org/262501750>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<ccebook.org> .
<http://webisa.webdatacommons.org/262501750>	<http://www.w3.org/ns/prov#value>	"The text covers each area of the mechanical system, providing an effective understanding of pollutants, source control, ventilation moisture, maintenance and other key factors in protecting indoor air quality." .