{"isbn_13": ["9780120887774"], "physical_format": "Hardcover", "subtitle": "A Central Concept in Biology", "weight": "2 pounds", "languages": [{"key": "/l/eng"}], "type": {"key": "/type/edition"}, "publishers": ["Academic Press"], "number_of_pages": 592, "id": 12532149, "first_sentence": {"type": "/type/text", "value": "Van Valen's assessment of our understanding and appreciation of phenotypic variation is only slightly less true today than it was 30 years ago."}, "isbn_10": ["0120887770"], "publish_date": "June 10, 2005", "key": "/b/OL9280380M", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "title": "Variation", "contributions": ["Benedikt Hallgr\u00edmsson (Editor)", "Brian K. Hall (Editor)"], "subjects": ["Evolution", "Genetics (non-medical)", "Science/Mathematics", "Life Sciences - Biology - Developmental Biology", "Science", "Variation (Biology)", "Earth Sciences - General", "Life Sciences - Evolution", "Science / Evolution", "Life Sciences - Biological Diversity"], "physical_dimensions": "9.3 x 6.1 x 1 inches", "revision": 1}