{"first_sentence": {"type": "/type/text", "value": "The discussion about principles in recent legal theory started with a now famous article by Ronald Dworkin, published in 1967 under the title 'Is Law a System of Rules?'"}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-29 15:03:11.581851"}, "weight": "1 pounds", "languages": [{"key": "/l/eng"}], "publishers": ["Springer"], "number_of_pages": 208, "isbn_13": ["9780792348566"], "id": 10606205, "edition_name": "1 edition", "isbn_10": ["0792348567"], "publish_date": "December 31, 1899", "key": "/b/OL7808542M", "authors": [{"key": "/a/OL265792A"}, {"key": "/a/OL2784276A"}], "title": "A Theory of Legal Sentences (Law and Philosophy Library)", "type": {"key": "/type/edition"}, "subjects": ["Foundations of law", "Immigration law", "Legislation", "Philosophy Of Law", "Legal Reference / Law Profession", "Law", "Logic", "General", "Law / General", "Jurisprudence", "Language", "Philosophy"], "physical_dimensions": "9.5 x 6.3 x 0.7 inches", "revision": 1}