"New Stations", Radio Service Bulletin, April 2, 1923, page 3.
"United States station assignments by frequency", Arrangement between the United States of America, Canada, Cuba, the Dominican Republic, Haiti, and Mexico, comprising recommendations of the North American Regional Radio-Engineering Meeting (supplemental to North American Regional Broadcasting Agreement, Habana, 1937). Signed at Washington January 30, 1941; effective March 29, 1941, page 1439.