personal link Posted by Govanus on 2 June 2015 in English. https://www.groundstability.com/public/web/home.jspx
OpenStreetMap
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په 2 June 2015 په 19:28 باندې د Govanus تبصره
https://www.gov.uk/coal-mining-records-data-deeds-and-documents#historic-data
په 2 June 2015 په 19:29 باندې د Govanus تبصره
https://www.gov.uk/government/publications/con29m-coal-and-brine-area-polygon-data
په 2 June 2015 په 19:52 باندې د Govanus تبصره
https://www.gov.uk/government/publications/ngec-regional-prime-maps