| Berg, R. E. (2024). Ultrasonics. Encyclopædia Britannica. Retrieved July 17, 2024, from https://www.britannica.com/science/ultrasonics. |
 
|
| Added by: Mark Grimshaw-Aagaard 7/17/24, 3:18 PM |
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| Jaekl, P. 2019, March 13. What is the mysterious 'global Hum' – and is it simply noise pollution? The Guardian. |
|
| Added by: Mark Grimshaw-Aagaard Last edited by: Mark Grimshaw-Aagaard 5/26/21, 5:04 PM |
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| Statutory order on noise from wind turbines. 2019. BEK nr 135 ed. |
|
| Added by: Mark Grimshaw-Aagaard Last edited by: Mark Grimshaw-Aagaard 7/11/22, 11:02 AM |
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| Strickland, A. (2023). Mysterious rumblings were recorded in Earth’s stratosphere. Retrieved May 12, 2023, from https://edition.cnn.com ... e-sounds-scn/index.html |
|
| Added by: Mark Grimshaw-Aagaard 5/16/23, 5:42 PM |
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| The Hum. (n.d.). Retrieved May 26, 2021, from https://en.m.wikipedia.org/wiki/The_Hum |
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| Added by: Mark Grimshaw-Aagaard 5/26/21, 5:06 PM |
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| Winship, L. 2025, May 21. Anyone fancy a subwoofer massage? The show that shakes you senseless. The Guardian. |
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| Added by: Mark Grimshaw-Aagaard 5/22/25, 11:59 AM |
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