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Sunspot and geomagnetic-storm data derived from Greenwich observations, 1874-1954
- "Observations"@en
- "Observations"
- "Sunspot and geomagnetic-storm data derived from Greenwich observations, 1874-1954"@en
- "Sunspot and geomagnetic-storm data derived from Greenwich observations, 1874-1954"
- "Sunspot and geomagnetic-storm data : derived from Greenwich observations, 1874-1954"
- "Sunspot and Geomagnetic-Storm Data 1874-1954"@en
- "Sunspot and geomagnetic-storm data, derived from Greenwich observations, 1874-1954"
- "Sunspot and geomagnetic-storm data derived from Greenwich observations 1874-1954"