- The Rotation Period Of The Sun As Determined From The Motion Of The Calcium Flocculi
- Historical And Descriptive Introduction: Measures Of Double Stars...
- The Rotation Period of the sun as Determined From Measures of Plates Taken With the Rumford Spectroheliograph
- The Rotation Period of the sun as Determined From Measures of Plates Taken With the Rumford Spectroheliograph
- Historical And Descriptive Introduction








