After a great article by Adam Kulikoff and a great post by Sharon Howard, I must mention that the current annual of Humboldt University’s Dokumenten- und Publikationsserver is dedicated entirely to digital history: Geschichte im Netz: Praxis, Chancen, Visionen. (There are a few English articles, too.) Particularly relevant is the section concerning digitalizing primary sources.

Scheme of Complete System of Digitalization

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