About: http://webisa.webdatacommons.org/95425641

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	I am sure you saw this in the other YS thread but just in case, one of the things they mentioned is that Magnetic Declination values are limited to +/- 12.7.
http://www.w3.org/ns/prov#wasQuotedFrom	rcgroups.com