About: http://webisa.webdatacommons.org/293158912

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	Trees usually produce pollen in the spring, grasses in the summer and weeds in the fall as part of their reproductive process.Other causes include organisms such as dust mites and molds.
http://www.w3.org/ns/prov#wasQuotedFrom	manythings.org