Diagram book, paper with card covers, Electric Multiple Units Profiles & General Information, issued by the BR (Eastern Region) Chief Mechanical & Electrical Engineer, Liverpool Street, London, Feb. 1979. Small outline diagrams of multiple unit formations, giving information such as speed, seats, numbers, weight etc., presumably intended as a driver's pocket reference. Made up from revision D of drawing no. C3/O/1. First version was issued in Jan. 1974