| Collection | George III Calendar |
| Reference | GEO/MAIN/4121-4158 |
| Title | March 1781 |
| Date | 1 - 31 March 1781 |
| Description | Includes volume of 'Secret Intelligence' covering 1779 to 1782 and related correspondence dating from 1780 |
| Language | English |
| Extent | 37 documents and 1 volume |
| Arrangement | Reference order has been maintained although some documents date from 1780, rather than 1781 |
| Level | Sub-series |