personal link ߊ߬ ߟߊߦߟߍ߬ߣߍ߲߬ ߦߋ߫ Govanus ߓߟߏ߫ 2 June 2015 ߦߋ߫ English ߟߋ߬ ߘߐ߫ https://www.groundstability.com/public/web/home.jspx
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ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ Govanus ߟߊ߫ 2 June 2015 at 19:28 ߘߐ߫
https://www.gov.uk/coal-mining-records-data-deeds-and-documents#historic-data
ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ Govanus ߟߊ߫ 2 June 2015 at 19:29 ߘߐ߫
https://www.gov.uk/government/publications/con29m-coal-and-brine-area-polygon-data
ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ Govanus ߟߊ߫ 2 June 2015 at 19:52 ߘߐ߫
https://www.gov.uk/government/publications/ngec-regional-prime-maps