| Hum Forum: Yahoo Group for discussion of mysterious hums. |
| Hum Haunts Indiana City; Its Source Is a Mystery: New York Times article about a mysterious low-frequency noise reported by residents of Kokomo, IN. |
| Taos Hum Page: 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. |
| The Guns of Barisal and Anomalous Sound Propagation: Discussion of research into the physics behind mysterious sounds resembling cannon fire, heard at Barisal, India, and other locations around the world. |
| The Hum: Investigation into the cause and adverse health effects of the Bristol Hum, an obnoxious low-frequency noise heard in England. Conclusion is that the hum is due to a pulsed electrical signal. |
| The Moodus Noises: Account of the legends and modern accounts of the mysterious sounds heard in Moodus, Connecticut. |
| Things That Go Boom in the Night: Article about the Moodus (Connecticut) noises and the findings of recent investigations that linked these noises with seismic activity. |
| Unexplained Sounds: About.com page gathers together information about mysterious booms, persistent hums, and underground rumblings that defy explanation. Includes audio clips. |
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