This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Callbook excerpt. en Commercial and government radio stations of the United States GPO Washington DC page Commercial and government radio stations of the United States US Government Printing Office Washington DC page Department of Commerce PDUSGov Uploaded with Amateur radio in print media Directories