About: http://webisa.webdatacommons.org/355329520

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	In the younger age group, where social contacts are tenuous in the extreme, there was a real difficulty in training an observer to record the group-changes quickly enough.
http://www.w3.org/ns/prov#wasQuotedFrom	brocku.ca