Poland

• Josef Tworek (1997): Subterranean tourist routes in Poland,
  31 pp, describes 9 caves, 11 mines, 3 cellars, 3 strategic and Military Objects. Glossy A4. Usual information, owner, opening times, description, length of visit, length of cave etc.
• Artur Zieliński, Aneta Marek, Zbigniew Zwolinski (2022): Geotourism Potential of Show Caves in Poland, Quaestiones Geographicae. 41. 169-181. researchgate DOI