mysite.du.edu: The Barisal Guns
Discussion of research into the physics behind mysterious sounds resembling cannon fire, heard at Barisal, India, and other locations around the world.
Keywords: barisal guns
paranormal.about.com: Unexplained Sounds
Mysterious booms, annoyingly persistent hums, and underground rumblings that defy explanation, from your About Guide
Keywords: mysterious , mystery , mystery boom , mystery sounds , paranormal phenomena
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