personal link Yuzen-it-id Govanus af 2 June 2015 s English https://www.groundstability.com/public/web/home.jspx
OpenStreetMap
Discussion
Awennit n Govanus di 2 June 2015 ɣef 19:28
https://www.gov.uk/coal-mining-records-data-deeds-and-documents#historic-data
Awennit n Govanus di 2 June 2015 ɣef 19:29
https://www.gov.uk/government/publications/con29m-coal-and-brine-area-polygon-data
Awennit n Govanus di 2 June 2015 ɣef 19:52
https://www.gov.uk/government/publications/ngec-regional-prime-maps