stalactites and stalagmites formations callao cave philippines |
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| navigate by keyword : ancient archaeology biology cagayan callao cave condition formation formations geography geology historical limestone minerals natural penablanca philippines shapes stalactites stalactities stalagmites stones textures tuguegarao walls |
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| Natural formations of stalactities and stalagmites on walls of callao cave located in penablanca, cagayan province in the philippines. |
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