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	Acoustical Detection of Aircrafts From the first world war until the 30's air acoustics played an important role in the air defence. As radar was still to be discovered, vision had to be supplemented by hearing using the sound of the engines. (MUSEUM "WAALSDORP": TNO-FEL Museum).
	Chirped Echo from the Mayan Pyramid of Kukulkan at Chichen Itza David Lubman of the Acoustical Society of America argues that the echo sounds like the primary call of the Mayan sacred bird, the Quetzal.
	Moving Beyond Prophecies & Predictions By Cynthia Gage (Atlantisrising)
	Rock Art Acoustics Steven. J. Waller's Home Page
	Stone Structures and Sound AltaVista -

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