Allan G. Bromley, in the 1990 article Difference and Analytical Engines: All but one of the programs cited in her notes had been prepared by Babbage from three to seven years earlier.
Historikern Allan G. Bromley skrev 1990 i sin essäbok Difference and Analytical Engines att alla utom ett av programmen i hennes noter hade förberetts av Babbage 3–7 år tidigare.