A comprehensive listing of record manufacturers during most of the 78 RPM recording era. Book is organized by record label name in alphabetic order from "ACO" to "Zonophone". Entries vary from a paragraph to several pages. Although text is not footnoted, each label's history is based on the author's knowledge as archivist for the BBC. Very helpful in dating a particular record by the recording matrix, catalog number and label design. Published in 1978 long before the internet, it nevertheless still contains more information on some topics than is easily available online.