It would be interesting to extend this post and visualization with other kinds of information. For instance, office documents, flyers, etc. Baekdal also leaves out books. Books would come in between 'local marketplace' and 'newspapers', I think. And office documents (like Word docs) came around 1990-1995? I remember typing my first report in WordPerfect around 1993. At that time you were still allowed to write your report in handwriting. Wow, time flies!
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