Sun near sunspot maximum, showing 23 spot groups
1937 July 13
- Title
- Sun near sunspot maximum, showing 23 spot groups
- Collection
- Caltech Photographs
- Series
- Photographs of Academic Divisions and Departments
- Sub-Series
- Astronomy (Astrophysics)
- Dates
- 1937 July 13
- Extents
- 1 photographs