a-l-cortie documents

Report on the Total Solar Eclipse of 1911, April 28. (Observed by the Expedition of the Joint Permanent Eclipse Committee to Vavau, Tonga Islands, South Pacific.)
Documents Report on the Total Solar Eclipse of 1911, April 28. (Observed by the Expedition of the Joint Permanent Eclipse Committee to Vavau, Tonga Islands, South Pacific.)
The 27-Day Period (Interval) in Terrestrial Magnetic Disturbance
Documents The 27-Day Period (Interval) in Terrestrial Magnetic Disturbance