About: http://webisa.webdatacommons.org/199261180

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	Some were directed to the markers themselves, such as the use of more than one marker, positioned at right angles, L or X shaped markers, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca