About: http://webisa.webdatacommons.org/422722065

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	They developed intensive farming techniques, including crop rotation, fertilizer and terracing.
http://www.w3.org/ns/prov#wasQuotedFrom	nationalgeographic.com