About: http://webisa.webdatacommons.org/330651465

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	Related to these challenges, especially as they involve such difficulties as slope gradients and alignment, are tunnels, the subject of Chapter 10.
http://www.w3.org/ns/prov#wasQuotedFrom	brynmawr.edu