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social network economic history urban studies economic institution history denmark crowdsourcing crowdsourcing 2.0 business model sustainability the human loop organization big data forskningens døgn 2015 geographical space trust 18th century #crowdsourcing#danishnationalarchives 19. century spanish flu pandemics crowdfunding machine learning metadata rdf city scapes images 20th century 1918-flu the spanish flu medical history localized knowledge