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1
Omega propagation correction tables for 3.4 kHz : area 11, North America station D (North Dakota) /
Published 1975“…Area 11, North America station D (North Dakota)…”
Government Document Book -
2
Omega propagation correction tables for 13.6 kHz : area 11, North America, station D (North Dakota) /
Published 1981“…Area 11, North America, station D (North Dakota)…”
Government Document Book -
3
Omega propagation correction tables for 10.2 kHz : area 11, North America, station D (North Dakota) /
Published 1981“…Area 11, North America, station D (North Dakota)…”
Government Document Book