Citations
Ordnance Survey surveyors instructions. Supplementary lists of instructions, 1981 - 1985, GBR/3296/Maps/CCSA.OS_151_9, OS_151_9. Cambridge University Library. |
|
Ordnance Survey surveyors instructions. Supplementary lists of instructions, 1981 - 1985, GBR/3296/Maps/CCSA.OS_151_9, OS_151_9. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/243288 Accessed April 29, 2025. |