About: http://webisa.webdatacommons.org/140540741

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 addition to looking at the size of the gob, we also look at the efficiency of moving air through the area we have to ventilate.???Men enter the mines by shaft elevators and most of the materials are transported through the slopes.
http://www.w3.org/ns/prov#wasQuotedFrom	coalage.com