Adams, Brian (1998–99). "198 years and 153 meridians, 152 defunct"(PDF). Streetlines. The Charles Close Society for the Study of Ordnance Survey Maps: 2. Archived from the original(PDF) on 26 October 2016. Retrieved 27 February 2016.
Adams, Brian (1998–99). "198 years and 153 meridians, 152 defunct"(PDF). Streetlines. The Charles Close Society for the Study of Ordnance Survey Maps: 2. Archived from the original(PDF) on 26 October 2016. Retrieved 27 February 2016.