{"subtitle": "Edited by George E. Valley, Jr. [and] Henry Wallman [under the supervision of the] Office of Scientific Research and Development, National Defense Research Committee.", "series": ["Massachusetts Institute of Technology.  Radiation laboratory series, 18"], "latest_revision": 2, "contributions": ["Wallman, Henry, 1915-"], "id": 28489602, "source_records": ["marc:marc_university_of_toronto/uoft.marc:3783466651:1333"], "title": "Vacuum tube amplifiers.", "languages": [{"key": "/languages/eng"}], "subjects": ["Amplifiers, Vacuum-tube", "Electronic apparatus and appliances"], "publish_country": "nyu", "type": {"key": "/type/edition"}, "revision": 2, "publishers": ["McGraw-Hill"], "last_modified": {"type": "/type/datetime", "value": "2009-10-20T18:44:07.761142"}, "key": "/books/OL18837280M", "authors": [{"key": "/authors/OL2214333A"}], "publish_places": ["New York"], "pagination": "xvii, 743 p.  illus., diagrs. ;", "created": {"type": "/type/datetime", "value": "2008-10-20T07:28:52.960907"}, "notes": {"type": "/type/text", "value": "Bibliographical footnotes."}, "number_of_pages": 743, "publish_date": "1948", "works": [{"key": "/works/OL176553W"}]}