Issued by the Bureau of Naviagation, Department of Commerce, Jan. 1915-Feb 28, 1927; by the Department of Commerce, Radio Division, March 31, 1927-June 30, 1932; by the Federal Radio Commission, July 30, 1932-July 1, 1934; by the Federal Communication Commission, July 15, 1934-
Supersedes the quarterly supplements to the list of Radio Stations of the United States, per Jan. 1915 issue