Which US oceanographer led the teams which discovered the wrecks of the Titanic in 1985 and the Bismarck in 1989?
Bob Ballard Robert Duane Ballard Robert Ballard Robert %22Bob%22 Ballard Robert d. ballard
robert duane ballard robert ballard robert d ballard bob ballard robert 22bob 22 ballard
robert ballard
WikipediaEntity
Robert Ballard