About: http://webisa.webdatacommons.org/78176225

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	However, all methods are subject to biological and other variables that are presently uncontrolled, and represent a major source of uncertainty.
http://www.w3.org/ns/prov#wasQuotedFrom	science.gov