Sunspot and geomagnetic-storm data, :
derived from Greenwich observations, 1874-1954, /
compiled under the direction of Sir Harold Spencer Jones.

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Corporate Author
Royal Greenwich Observatory.
Language(s)
English
Published
London : H.M. Stationery Off., 1955.
Subjects
Sunspots.
Geomagnetism > Observations.
Physical Description
viii, 106 p. : diagrs. ; 31 cm
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