About: http://webisa.webdatacommons.org/269144986

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	Intentionally-graded materials that are fabricated as such, and unintentionally-graded materials such as samples that change as a function of depth due to natural material diffusion over time, are included.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es