| Reference number | NLB/57/609 |
| Alternative reference number | NLB/57p348 |
| Level | Item |
| Title | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent |
| Date | 16 December 1919 |
| Description | 'Herewith a batch of new certificates for 3 proofs each. Print precisely same style as hitherto.' |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |