About: http://webisa.webdatacommons.org/383437416

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	The following is a chronological list of all significant three-letter callsign actions taken from May 1921 through January 1, 2015, for every three-letter call used by standard stations on the AM broadcast band.
http://www.w3.org/ns/prov#wasQuotedFrom	earlyradiohistory.us