Gruta dos Ecos (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gruta dos Ecos" in Polish language version.

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caves.org

Ivo Karmann, Luis Enrique Sánchez, Thomas Rich Fairchild. Genesis and geomorphologic context of a cave developed in schist, quartzite, and marble. „Journal of Cave and Karst Studies”. 63 (1), s. 41-47, 2001. (ang.).