Bird, P. (1994) ‘LEO, the First Business Computer’, Hasler Publishing: 

Peter Bird joined Lyons when, as he says, ‘the pioneering years of computing were no more than folk history.’ Nonetheless, through his ‘talking with old-timers’ and delving through the Lyons archives, he has made an important contribution to the LEO story. Of particular value are the appendices which, inter alia, give details of the instruction codes, speeds, capacities and deliveries of the different models.

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