About: http://webisa.webdatacommons.org/147900445

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	The term ???substantially flat??? as used herein with reference to a surface is intended to broadly refer to a condition of a surface that is substantially free of bumps, ridges, and other irregularities.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com