Sunspots in action;

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The sunspot.

Editor: J.S. Ricard.

Sunspot numbers, 1610-1985 : based on "The sunspot activity in the years 1610-1960" /

Mode of access: Internet.

Astronomische Mitteilungen von Dr. Rudolf Wolf.

Mode of access: Internet.

Observations of the spots on the sun from November 9, 1853, to March 24, 1861, made at Redhill,

On t.-p.: The publication of this work was aided by a grant from the fund placed at the disposal of the Royal society by Her Majesty's Treasury.

Solar relations to weather and life.

Mode of access: Internet.

Photoheliographic results.

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