The law of sun-spot polarity

[1] HALE, MT WILSON CONTR, V165

[2] HALE, 1919, ASTROPHYSICAL J, V49, P153

[3] *MOUNT WILS OBS, CONTR MOUNT WILS OBS, V300

[4] NICHOLSON, 1919, PUBLICATIONS ASTRONO, V31, P277

[5] 1924, P NATL ACAD SCI, V10, P53

[6] 1924, NATURE, V113, P105

[7] 1919, ASTROPHYSICAL J, V49, P153

[8] MT WILSON CONTR, V165

[9] 1924, PUBLICATIONS ASTRONO, V36, P355

[10] 1925, MONTHLY NOTICES, V85, P467

[1] HALE, MT WILSON CONTR, V165

[2] HALE, 1919, ASTROPHYSICAL J, V49, P153

[3] *MOUNT WILS OBS, CONTR MOUNT WILS OBS, V300

[4] NICHOLSON, 1919, PUBLICATIONS ASTRONO, V31, P277

[5] 1924, P NATL ACAD SCI, V10, P53

[6] 1924, NATURE, V113, P105

[7] 1919, ASTROPHYSICAL J, V49, P153

[8] MT WILSON CONTR, V165

[9] 1924, PUBLICATIONS ASTRONO, V36, P355

[10] 1925, MONTHLY NOTICES, V85, P467