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Retrieved 20 July 2011. Beynen, Philip E Van (29 July 2011). Karst Management. Springer. p. 62. ISBN 978-94-007-1206-5. Retrieved 20 July 2011. v t e...

ISBN 0-231-03623-X van Beynen, P. (Ed.), Karst management, Springer, 2011, ISBN 978-94-007-1206-5 Vermeulen, J.J., Whitten, T., "Biodiversity and Cultural Property...

Karst Management. pp. 75–102. doi:10.1007/978-94-007-1207-2_4. ISBN 978-94-007-1206-5. "What is a sinkhole?". CNC3. 14 March 2016. Retrieved 31 March 2016...