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Traditionally, you start from a Word document that gets “placed” in InDesign, and then you start the time consuming process of laying everything out in various styles. However, if you already have a proper digital format such as an epub or clean HTML code, it is simpler and faster to convert the (already marked up) HTML to a Word document with the styles already applied, then import and “map” the styles to a good existing InDesign template such as “Wellred Origins” or “Wellred Chartism”. This is by far the quickest method (as tested on the new Feuerbach book, whose rough draft I put together in a few hours), but it needs to be further tweaked and ideally inspected by an InDesign professional.