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). www.tno.nl/instit/fel/museum/en/airacous.html
Archacous's Page - Scientific Applications of Acoustics to the Study of History (Acoustical Society of America) hometown.aol.com/Archacous/page/index.htm
Mayan Ruins and Unexplained Acoustics - Discussion of various acoustical oddities of the Great Ballcourt and the Castillo at Chichen Itza and the pyramids at Palenque. www.mm2000.nu/sphinxw.html