About: http://webisa.webdatacommons.org/1812469

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	But regardless of base, the black-and-white silver image is vulnerable to excessive heat and moisture and to harmful gases such as sulfur dioxide and nitrogen oxides often found in urban and suburban environments.
http://www.w3.org/ns/prov#wasQuotedFrom	archives.gov