What does PIES stand for?

MLA style: "PIES." Acronym Finder . 2012. AcronymFinder.com 3 Jun. 2012 http://www.acronymfinder.com/Pressure-Inverted-Echo-Sounder-(PIES).html
Chicago style: Acronym Finder . S.v. "PIES." Retrieved June 3 2012 from http://www.acronymfinder.com/Pressure-Inverted-Echo-Sounder-(PIES).html
APA style: PIES. (n.d.) Acronym Finder. (2012). Retrieved June 3 2012 from http://www.acronymfinder.com/Pressure-Inverted-Echo-Sounder-(PIES).html

Pressure Inverted Echo Sounder

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