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Echolocation in Bats and Dolphins: Chromolama C, video from BBC
Echolocation: Living Waters - Secrets of Dolphin Echolocation: Illustra Media
SONAR: Scientists "See" Ocean Floor via Sonar: National Geographic
Echocardiogram (Echo)
(Click link to watch on You Tube)
Echocardiogram: Having an Echo: Royal Children's Hospital Melbourse
Fetal Ultrasound: How Ultrasound Works: Animed
Fetal Ultrasound: 3D Ultrasound 25 Weeks: Elena Wormington
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