StrangeSounds.org, 2013-04-09 - Famous sinkholes around the world: A huge sinkhole opens up in Marvão, Portugal
[Publication], 2010-06-01 - Guatemala Sinkhole Is MASSIVE, Swallows Building (PICTURE)
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Worldwide Sinkhole NewsStrangeSounds.org, 2013-04-09 - Famous sinkholes around the world: A huge sinkhole opens up in Marvão, Portugal [Publication], 2010-06-01 - Guatemala Sinkhole Is MASSIVE, Swallows Building (PICTURE) About this Webpage
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