石炭--炭業経済--炭業史・事情(道央:石狩振興局,空知総合振興... - Japan Search model RDF
(There is only one resource "石炭--炭業経済--炭業史・事情(道... (Concept)" with description graph. Other 3 resources are in nested tables, or just refer to the source resource and have no own description)