{"isbn_13": ["9780444815163"], "last_modified": {"type": "/type/datetime", "value": "2008-04-29 13:35:46.87638"}, "languages": [{"key": "/l/eng"}], "publishers": ["Elsevier Science"], "number_of_pages": 688, "first_sentence": {"type": "/type/text", "value": "The chemical nature of humic substances is perhaps one of the most frequently discussed and recurrent topics in science."}, "isbn_10": ["0444815163"], "publish_date": "June 1, 1996", "key": "/b/OL7532157M", "authors": [{"key": "/a/OL2708883A"}], "title": "Humic Substances in Terrestrial Ecosystems, First Edition", "type": {"key": "/type/edition"}, "id": 10253585, "revision": 1}