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1
Omega propagation correcton tables for 10.2 kHz : area 18, South Atlantic, station D (North Dakota) /
Published 1985“…Area 18, South Atlantic, station D (North Dakota)…”
Government Document Book -
2
Omega propagation correcton tables for 13.6 kHz : area 18, south Atlantic, station D (North Dakota) /
Published 1978“…Area 18, South Atlantic, station D (North Dakota), …”
Government Document Book