Charles Babbage, father of the computer : Halacy, D. S. (Daniel Stephen), 1919- : Free Download & Streaming : Internet Archive. 1919.
Charles Babbage, father of the computer : Halacy, D. S. (Daniel Stephen), 1919- : Free Download & Streaming : Internet Archive [link]Paper  bibtex   
@misc{noauthor_charles_1919,
	title = {Charles {Babbage}, father of the computer : {Halacy}, {D}. {S}. ({Daniel} {Stephen}), 1919- : {Free} {Download} \& {Streaming} : {Internet} {Archive}},
	url = {https://archive.org/details/charlesbabbagefa00hala?q=%22calculating+machine%22+1850},
	urldate = {2017-12-16TZ},
	year = {1919}
}
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