@misc{underground+mining+heritage+sites+preservation+and+safeguarding,
    author = {Wieja, Tomasz},
    title = {Underground mining heritage sites: Preservation and safeguarding},
    journal = {Wiadomości Konserwatorskie},
    address = {Warszawa},
    publisher = {Stowarzyszenie Konserwatorów Zabytków},
    number = {nr 68S},
    ISSN = {0860-2395}
}