Sunspot and geomagnetic-storm data derived from Greenwich observations, 1874-1954 : derived from Greenwich Observations, 1874-1954
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Sunspot and geomagnetic-storm data derived from Greenwich observations, 1874-1954 : derived from Greenwich Observations, 1874-1954
Her Majesty's Stationery Office, 1955
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At head of title: Royal Grennwich Observatory