Here are entered general works on radio, including works on early radio, sometimes called "wireless telephone." Works on point-to-point radiotelephone service and equipment, sometimes called "wireless telephone," are entered under Radiotelephone. --subdivision Radio equipment under subjects, e.g. Automobiles--Radio equipment; and headings beginning with the word Radio
Here are entered general works on telephone systems. Works on telephone systems in a particular place are entered under Telephone--[local subdivision].
