About: http://webisa.webdatacommons.org/120168103

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	At least 10???20 trees per species are sampled at a site, mostly by taking increment cores, and each tree is cored following specific guidelines (Grissino-Mayer 2003).
http://www.w3.org/ns/prov#wasQuotedFrom	nap.edu