Stock Photo - Pumice stones lie in a historic manufacturing plant to dry in a specific framework in the museum of the pumice industry in Kaltenengers, Germany, 02 April 2014. A museum dedicates itself to the history of the volcano park. The opening will be on 16 April 2014. Photo: Thomas Frey/dpa | usage worldwide. - Kaltenengers/Rhineland-Palatinate/Germany

Stock Photo: Pumice stones lie in a historic manufacturing plant to dry in a specific framework in the museum of the pumice industry in Kaltenengers, Germany, 02 April 2014.

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