About: http://webisa.webdatacommons.org/406364625

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	My dad assumes they used them as an airstop, to prevent air from passing through it easily, sort of an insulation I guess.
http://www.w3.org/ns/prov#wasQuotedFrom	usms.org