personal link Govanusने 2 June 2015 ला English भाषेत लिहीले https://www.groundstability.com/public/web/home.jspx
OpenStreetMap
Discussion
Govanusकडून 2 June 2015, 19:28 लाला अभिप्राय
https://www.gov.uk/coal-mining-records-data-deeds-and-documents#historic-data
Govanusकडून 2 June 2015, 19:29 लाला अभिप्राय
https://www.gov.uk/government/publications/con29m-coal-and-brine-area-polygon-data
Govanusकडून 2 June 2015, 19:52 लाला अभिप्राय
https://www.gov.uk/government/publications/ngec-regional-prime-maps