The History of Harvard Mark 1: A Complete Guide - History-Computer
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Collection of Historical Scientific Instruments Mark I – Cambridge, Massachusetts - Atlas Obscura
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Harvard Mark I - Wikipedia
Harvard Mark I - Wikipedia
Bonhams : HARVARD MARK I MANUAL [HOPPER, GRACE.] Staff of the Computation Laboratory. A Manual of Operation for the Automatic Sequence Controlled Calculator. Cambridge: Harvard University Press: 1946.
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The Harvard Mark I
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Harvard Mark I | computer technology | Britannica
Collection of Historical Scientific Instruments Mark I – Cambridge, Massachusetts - Atlas Obscura