urn:ddi:int.naddi:693392a1-a97a-442e-be79-492b2d7d59bb:2 int.naddi 693392a1-a97a-442e-be79-492b2d7d59bb 2 jeremy fri_crowdsource urn:ddi:int.naddi:5db7dea4-00de-4ea9-8598-9f551530046e:2 int.naddi 5db7dea4-00de-4ea9-8598-9f551530046e 2 fri_crowdsource Experiments with Crowdsourcing Metadata in a Social Science Environment int.naddi e1914a77-c0d4-4fd4-b22e-64bd3d23113f 1 CodeList