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Studies provide no certainty in shipwreck search
FILE - In this June 15, 2013 file photo, explorer Steve Libert waits on a fishing boat as dive teams prepare to inspect a site in northern Lake Michigan. Libert, who has searched 30 years for the French explorer La Salle’s lost ship the Griffin, hauled a nearly 400-pound beam ashore in June. Five months after a dive team searched Lake Michigan for a 17th century shipwreck, it's still uncertain whether a wooden slab they removed from the lake bottom was part of the legendary Griffin. (AP Photo/John Flesher, File)

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