  |
Unexplained Sounds - http://paranormal.about.com/library/weekly/aa031599.htm
About.com page gathers together information about mysterious booms, persistent hums, and underground rumblings that defy explanation. Includes audio clips. |
  |
The Guns of Barisal and Anomalous Sound Propagation - http://www.du.edu/~jcalvert/waves/barisal.htm
Discussion of research into the physics behind mysterious sounds resembling cannon fire, heard at Barisal, India, and other locations around the world. |
  |
Taos Hum Page - http://www.eskimo.com/~billb/hum/hum.html
Information and links about the "Taos Hum," a low throbbing sound heard in quiet locations worldwide, especially in the USA, UK, and northern Europe. It is not detectable by microphones or VLF antennae, and the source is still a mystery. |