{"first_sentence": {"type": "/type/text", "value": "Investigation of the structure of ionospheric irregularities is a very important topic for many practical problems, both in geophysical research (in studying the structure of the ionosphere and the physics of processes running there) and in various radio applications associated with radio wave propagation (since the ionosphere as a medium of propagation may cause a noticeable effect on the operation of various navigation, location, and communication systems)."}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "weight": "1.4 pounds", "languages": [{"key": "/l/eng"}], "publishers": ["Springer"], "number_of_pages": 260, "isbn_13": ["9783540004042"], "id": 12252410, "edition_name": "1 edition", "isbn_10": ["3540004041"], "publish_date": "October 2, 2003", "key": "/b/OL9053783M", "authors": [{"key": "/a/OL3177593A"}, {"key": "/a/OL3177594A"}], "title": "Ionospheric Tomography (Physics of Earth and Space Environments)", "type": {"key": "/type/edition"}, "subjects": ["Electricity, magnetism & electromagnetism", "Geophysics", "Medical diagnosis", "Medical imaging", "Tomography", "Physics", "Earth Sciences - Meteorology & Climatology", "Science", "Scientific applications", "Science/Mathematics", "Remote sensing", "Astronomy - General", "Science / Astrophysics & Space Science", "Diagnostic Imaging", "Medical", "Ionosphere"], "physical_dimensions": "9.5 x 6.3 x 0.8 inches", "revision": 1}