About: http://webisa.webdatacommons.org/168624561

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	Since radio communication is a comparatively recent development in this ancient trade, they had to devise ways for an incoming ship to select a pilot, and establish rules to be enforced by the Port Wardens about how to go about it.
http://www.w3.org/ns/prov#wasQuotedFrom	philadelphia-reflections.com