{"first_sentence": {"type": "/type/text", "value": "Human beings have flourished on Earth for at least 2.5 million years."}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "weight": "4.3 pounds", "publishers": ["James Clarke & Co Ltd"], "number_of_pages": 1243, "isbn_13": ["9780227679685"], "id": 12749849, "edition_name": "New Ed edition", "isbn_10": ["0227679687"], "publish_date": "January 17, 2002", "key": "/b/OL9464341M", "authors": [{"key": "/a/OL222080A"}], "title": "The Encyclopedia of World History", "type": {"key": "/type/edition"}, "subjects": ["Reference works", "World history", "History: World"], "physical_dimensions": "10.1 x 8.1 x 1.9 inches", "revision": 1}