| Reference number | NLB/40/660 |
| Alternative reference number | NLB/40/ p396 |
| Level | Item |
| Title | Copy letter from Robert William Frederick Harrison to H [Herbert] E [Edmeston] Watson |
| Date | July 1909 |
| Description | 'On "The spectrum of radium emanation". Harrison adds remarks upon the paper for Watson's consideration. |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |