About: http://webisa.webdatacommons.org/213237945

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	Fifty years ago, however, polio was a dark shadow that arrived every summer, a deep fear hanging over every child and parent.
http://www.w3.org/ns/prov#wasQuotedFrom	amazon.com