About: http://webisa.webdatacommons.org/430979657

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	During the war it was especially useful to Roosevelt, Churchill, and others for gauging relative distances over water, a crucial factor in allocating scarce shipping resources while planning grand strategy.
http://www.w3.org/ns/prov#wasQuotedFrom	loc.gov