urn:ddi:int.naddi:07203d96-1339-41b2-bf6f-0d8161e4f1fd:2 int.naddi 07203d96-1339-41b2-bf6f-0d8161e4f1fd 2 jeremy fri_gamification urn:ddi:int.naddi:c99a9a0c-0834-493f-aafb-1b0d1f00e085:2 int.naddi c99a9a0c-0834-493f-aafb-1b0d1f00e085 2 fri_gamification Metadata-driven Gamification: Exploring a New System foro Crowdsourcing Antebellum History int.naddi e1914a77-c0d4-4fd4-b22e-64bd3d23113f 1 CodeList