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Num Mark Subjects (1-5 of 5) Year Entries
20 Found
1 Sinkholes.   13
2 Sinkholes -- Environmental aspects.   3
3 Sinkholes -- Florida.   2
4 Sinkholes -- United States : Sunday morning. The hole truth / producer, Amol Mhatre  2013 1
5 Sinkholes -- Yucatán Peninsula : Natural world. Secrets of the Maya underworld / producer, Tim Scoones ; a BBC/Discovery Channel co-production  2005 1
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