201.
The Rotation Period of the Sun as Determined from the Motion of the Calcium Flocculi
by Hale, George Ellery
ISBN: 9781022237858
202.
The Rumford Spectroheliograph of the Yerkes Observatory
by Hale, George Ellery 1868-19...
ISBN: 9781021811677
204.
Photography of the Solar Prominences - Scholar's Choice Edition
by Hale, George Ellery
ISBN: 9781295978571