en
621.38 Electronics, communications engineering
621.382 Communications engineering
621.382092 Communications engineers 621.3821 Communications networks 621.3822 Signal processing 621.3823 Miscellaneous topics 621.3824 Antennas and propagation 621.3825 Relay communication 621.3827 Optical communications 621.3828 Acoustical communications
Dewey Decimal Classification
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