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<http://webisa.webdatacommons.org/prov/38501058>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/176837103> .
<http://webisa.webdatacommons.org/176837103>	<http://www.w3.org/ns/prov#value>	"In addition, soil gas ventilation systems should be combined with proper foundation design and construction techniques to limit possible admission of radon, water vapor, herbicides, methane, and other toxins." .
<http://webisa.webdatacommons.org/176837103>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<umn.edu> .