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Keywords:
ROYAL AIR FORCE,
RAF,
METHODS,
AIR,
NAVIGATION,
THEORY,
AIDS,
INSTRUMENTS,
COMPASSES,
SPEED,
POSITIONS,
WIND,
ASTRONOMICAL,
RADAR,
GEE,
CONSOL,
H2S,
EQUIPMENT,
DEVICES,
SPEED,
INSTRUMENTATION
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© Thomas Telford and ICE
1947
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