Contributions from the Mount Wilson Solar Observatory
Uitgaven: Volume III, Nos 53 - 69, March 1911 - Dec. 1912;Volume IV, Nos 70 - 82, Feb. 1913 - January 1914;Volume V, Nos 83 - 105, Feb. 1914 - June 1915;Volume VIII, Nos 148 - 168, Feb. 1918 - March 1919;Volume IX, Nos 169 - 199, March 1919 - Oct. 1920