| ACE | Automatic Computing Engine |
| AL | autograph letter |
| ALS | autograph letter signed |
| AMS | autograph manuscript |
| AMT | Alan Mathison Turing |
| APCS | autograph postcard signed |
| c. | circa |
| CSAC | Contemporary Scientific Archives Centre |
| CTL | carbon typed letter |
| CTS | carbon typescript |
| KCC | King's College, Cambridge |
| LMS | London Mathematical Society |
| MS | manuscript |
| MSS | manuscripts |
| n.d. | no date |
| no. | number |
| NPL | National Physical Laboratory, Teddington, Middlesex |
| n.y. | no year |
| p.m. | postmark |
| R.S. | References to the bibliography provided by M.H.A. Newman in Biographical Memoirs of Fellows of the Royal Society (Vol. 1, Nov. 1955, p.263). A copy is catalogued as A/36 |
| sh. | sheet(s) |
| TLS | typed letter signed |
| TPCS | typed postcard signed |
| TS | typescript |
| vol. | volume |
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