English text, English, French and German introduction and notes.
Previous ed.: 1975.
World electricity supplies : a survey of supply voltages throughout the world = Un rapport sur les tensions d'alimentation dans le monde entier = Eine Übersicht über Versorgungsspannungen in aller Wel by Technical Help to Exporters. ISBN 090587790X. Published by Technical Help to Exporters (Service) in 1978. Publication and catalogue information, links to buy online and reader comments.