Sunspot and geomagnetic-storm data, derived from Greenwich observations, 1874-1954.
Subtitle: Compiled under the direction of Sir Harold Spencer Jones.
Contributors: Jones, Harold Spencer, (Sir) 1890-
Publisher: H.M. Stationery Off.
Published: 1955
Place of publication: London
Language: eng
Number of pages: 106
Subjects: Magnetism, Terrestrial -- Observations; Sunspots.