personal link Zapsal Govanus 2. 6. 2015 v jazyce English. https://www.groundstability.com/public/web/home.jspx
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Komentář od Govanus z 2. 06. 2015 v 19:28
https://www.gov.uk/coal-mining-records-data-deeds-and-documents#historic-data
Komentář od Govanus z 2. 06. 2015 v 19:29
https://www.gov.uk/government/publications/con29m-coal-and-brine-area-polygon-data
Komentář od Govanus z 2. 06. 2015 v 19:52
https://www.gov.uk/government/publications/ngec-regional-prime-maps