{"languages": [{"key": "/l/eng"}], "physical_format": "Paperback", "subtitle": "Nebraska Test Tractors 1920-1960 (Farm Tractor Data Books)", "weight": "1.9 pounds", "publishers": ["Motorbooks International"], "number_of_pages": 256, "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "id": 12794515, "isbn_13": ["9780760304778"], "isbn_10": ["0760304777"], "publish_date": "May 1999", "key": "/b/OL9502119M", "authors": [{"key": "/a/OL537312A"}], "title": "The Ultimate American Farm Tractor Data Book", "type": {"key": "/type/edition"}, "subjects": ["Agricultural engineering & machinery", "Automotive technology", "Reference works", "Inter-war period, 1918-1939", "Postwar period, 1945 to c 2000", "Second World War, 1939-1945", "Specifications", "Transportation", "USA", "Automotive - Antique & Classic", "Farm tractors", "Automotive - General", "United States"], "physical_dimensions": "10.6 x 8.3 x 0.8 inches", "revision": 1}