{"first_sentence": {"type": "/type/text", "value": "Air is comprised of a mixture of approximately 79% nitrogen and 21% oxygen."}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-29 15:03:11.581851"}, "weight": "1 pounds", "languages": [{"key": "/l/eng"}], "publishers": ["CRC"], "number_of_pages": 283, "isbn_13": ["9780824799083"], "id": 11054371, "edition_name": "1 edition", "isbn_10": ["0824799089"], "publish_date": "November 19, 1997", "key": "/b/OL8160856M", "authors": [{"key": "/a/OL2880550A"}], "title": "Industrial Gases in Petrochemical Processes (Chemical Industries)", "type": {"key": "/type/edition"}, "subjects": ["Chemical industries", "Gas technology", "Petroleum technology", "Science/Mathematics", "Natural Gas", "Technology", "Technology & Industrial Arts", "Chemistry - Industrial & Technical", "Engineering - Chemical & Biochemical", "Science / Chemistry / Technical & Industrial", "Gases", "Petroleum", "Petroleum Chemicals"], "physical_dimensions": "9.2 x 6 x 0.8 inches", "revision": 1}