{"type": {"key": "/type/work"}, "title": "Die Entwickelung des Niederrheinisch-Westf\u00e4lischen Steinkohlen-Bergbaues in der Zweiten H\u00e4lfte des 19. Jahrhunderts", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL9681701A"}}], "key": "/works/OL25622893W", "latest_revision": 1, "revision": 1, "created": {"type": "/type/datetime", "value": "2021-10-02T21:21:07.098317"}, "last_modified": {"type": "/type/datetime", "value": "2021-10-02T21:21:07.098317"}}