{"first_sentence": {"type": "/type/text", "value": "Although the Greek philosopher Democritus had postulated the existence of atoms in the first century BC and Dalton's atomic theory of 1807 laid the basis for modern chemistry, there was no direct evidence for the existence of atoms before the turn of the twentieth century."}, "physical_format": "Paperback", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "weight": "7.8 ounces", "languages": [{"key": "/l/eng"}], "publishers": ["CRC"], "number_of_pages": 192, "isbn_13": ["9780412782800"], "id": 12651024, "edition_name": "1 edition", "isbn_10": ["0412782804"], "publish_date": "May 15, 1997", "key": "/b/OL9381718M", "authors": [{"key": "/a/OL3248731A"}], "title": "Atomic Physics (Physics and Its Applications)", "type": {"key": "/type/edition"}, "subjects": ["Atomic & molecular physics", "Materials science", "Quantum physics (quantum mechanics)", "Science", "Science/Mathematics", "Nuclear Physics", "Science / Nuclear Physics"], "physical_dimensions": "8.4 x 5.4 x 0.5 inches", "revision": 1}