. . "Citizens band radio United States." . . "Emergency communication systems." . . "Citizens band radio." . . "United States. National Highway Traffic Safety Administration." . . "Emergency communication systems United States." . . . . . . . . . . . "2 lesson plan : monitor ; training program for CB radio emergency monitors"@en . . "2 lesson plan monitor ; training program for CB radio emergency monitors"@en . . . . . . "Monitor : training program for CB radio emergency monitors : 2 lesson plan" . . . . "2 lesson plan : monitor; training program for CB radio emergency monitors" . . . "United States." . .