http://dewey.info/scheme/a14/ en
621.384 Radio and radar
621.3848 Radar
http://dewey.info/scheme/a14/ vi
621.384 Vô tuyến điện và rađa
621.3848 Rađa
http://dewey.info/scheme/a14/ it
621.384 Radio e radar
621.3848 Radar
http://dewey.info/scheme/edition/e23/ en
621.384 Radio and radar
621.3848 Radar
621.38483 Specific instruments and devices 621.38485 Systems
http://dewey.info/scheme/edition/e22/ de
621.384 Funk und Radar
621.3848 Radar
621.38483 Einzelne Instrumente und Geräte 621.38485 Systeme
Dewey Decimal Classification
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