1. Poland on photography https://polska-org.pl/ Access 7 June 2019 (2018)
2. Z. Kasztelewicz, Reclamation of post-mining areas in the Polish open pit mines (Science and Mining Traditions Foundation, Kraków, 2010), pp. 14 [in Polish]
3. Act of February 3rd, 1995 on agricultural and forest lands protection [Journal of Laws 1995 no. 16 item 78. [in Polish]
4. Central Statistical Office, Environment protection 2018 https://stat.gov.pl Access 9 June 2019 (2018) [in Polish]
5. Supreme Chamber of Control, Protection and management of post-mining spoil tips https://www.nik.gov.pl Access 10 June 2019 [in Polish]