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Harvard's Mark 1 finds its new home – Harvard Gazette
Collection of Historical Scientific Instruments Mark I – Cambridge, Massachusetts - Atlas Obscura
IBM Archives: IBM's ASCC (a.k.a. The Harvard Mark I)
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The IBM ASCC / Havard Mark 1
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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