| Reference number | HWT/44 |
| Alternative reference number | HWT.C.362 |
| Level | Series |
| Title | Photoelectric Spectrometry Group |
| Date | 1949-1951 |
| Description | Includes bulletins 1949, 1950; committee papers and minutes of second Annual General Meeting, 26 October 1950. |
| Extent | 1 folder |
| Format | Typescript and printed documents |
| Access status | Open |