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current01:40, 7 March 2011Thumbnail for version as of 01:40, 7 March 2011441 × 360 (182 KB)HopsonRoad{{Information |Description ={{en|1=Acoustic model of probability for detecting an arriving helicopter.}} |Source =http://www.crrel.usace.army.mil/technical_areas/sp/ |Author =CRREL Researcher |Date =2010-00-00 |Permission
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