| RefNo | EXP/11/1/2/22 |
| AltRefNo | H.BAY/21 |
| Level | File |
| Title | Halley Bay expedition data: radiosonde frequency/ time graphs, form 2818 |
| Date | 1 October - 31 October 1957 |
| Description | Completed Air Ministry, Meteorological Office, Radio Sonde Frequency Graphs (Form 2818). Raw data from Halley Bay. |
| Extent | One box |
| AccessStatus | Open |