Dual frequency /20.0 - 19.9 kHz/ VLF data
Dual frequency VLF data related to solar activity
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Engineering topics
Publications and source records attributed to Looney, C. H., Jr..
Dual frequency VLF data related to solar activity
Dual frequency VLF timing system for synchronization of remotely located clocks, noting WWVL radio carrier frequency, signal generator, etc
Coverage diagrams for X-Y and elevation-over- azimuth antenna mounts used in satellite tracking
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