About: http://webisa.webdatacommons.org/268215169

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	It seems they did it by maintaining stocks of baked-clay tokens???one token for each item, different shapes for different types of items.
http://www.w3.org/ns/prov#wasQuotedFrom	collapseofindustrialcivilization.com