| RGO Archives/RGO 9 contains: |
|---|
| <-- See earlier |
|---|
| 111 |
Correspondence on the photographic zenith tube |
| 112 |
Correspondence on chronographs |
| 113 |
Correspondence on microphotometers |
| 114 |
Correspondence on instruments |
| 115 |
Correspondence on transit instruments |
| 116 |
Correspondence on magnetic instruments |
| 117 |
Correspondence on variometers |
| 118 |
Correspondence on meteorological instruments |
| 119 |
Correspondence on magnetism and meteorology |
| 120 |
Correspondence on chronographs |
| 121 |
Correspondence on microphotometers |
| See later --> |
|---|
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