Hollingdale, S.H. & Toothill , G.C., (1965), Electronic Computers. Penguin (Pelican) Books, London. This early book on the history of computers includes a number of references to LEO. See pages 230 and 281-282, and a photograph. It is a brief but accurate account noting payroll and teashop ordering. What is also interesting, in a book published in 1965, is the absence of any mention of war—time computing in Bletchley or any computer innovations outside the USA and UK. A surprising number of pages are devoted to analogue computers. A second edition was published in 1975. See Electronic Computers
