E. F. Johnson Company Manual. Viking 260 Citizens Radio Transceiver Installation and Operating Manual. Material: paper. Size: 5 1/2" x 8 1/4". Description: orange and white cover; black and white photograph of the Viking 260; black print: "Viking 260, 40 Channel, Citizens Radio Transceiver, Model No. 242-0260, Installation and Operating Manual"; 7 pages.