Radio Stations Zones with Call Signs of the United States1961-01-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_038_14_0000_4_138The map showcases the United States segmented into three distinct regions, further divided into zones based on radio station coverage. Each zone is identified by the initial letters, or call signs, of the radio stations. The map is a national xerographic copy, measuring 8 7/16 by 13 7/8 inches.