{"isbn_13": ["9780405019081"], "physical_format": "Hardcover", "weight": "1.2 pounds", "languages": [{"key": "/l/eng"}], "publishers": ["Ayer Co Pub"], "title": "Negro in Pennsylvania: A Study in Economic History (American Negro :  His History & Literature Series 2)", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "id": 12834210, "edition_name": "Revised edition", "isbn_10": ["0405019084"], "publish_date": "April 1996", "key": "/b/OL9534147M", "authors": [{"key": "/a/OL3280011A"}], "type": {"key": "/type/edition"}, "subjects": ["History: American"], "physical_dimensions": "9 x 6 x 0.8 inches", "revision": 1}