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