[SWI = Special World Intervals]. Correspondence re day and night addresses for those to be notified; cables re alerts; some correspondence re late reception of alerts; scheme for liaison of alert warnings and SWI messages worldwide; log of telegrams re alerts; batches of cables re alerts.
I.G.Y. Alerts and SWI Messages
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- ReferenceGB 133 JBA/IGY/1/3
- Dates of Creation1957-1958