| RGO Archives/RGO 9 contains: |
|---|
| <-- See earlier |
|---|
| 104 |
Correspondence on the Schmidt Telescope |
| 105 |
Correspondence on the reversible transit circle |
| 106 |
Correspondence on cosmic ray instruments |
| 107 |
Correspondence on the spectroheliograph reflector |
| 108 |
Correspondence on the stellar photometer |
| 109 |
Correspondence on the astrographic telescope. |
| 110 |
Correspondence on photographic zenith tubes |
| 111 |
Correspondence on the photographic zenith tube |
| 112 |
Correspondence on chronographs |
| 113 |
Correspondence on microphotometers |
| 114 |
Correspondence on instruments |
| See later --> |
|---|
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