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The Five Most Likely Explanations for Long Delayed Echoes - Department of Physics
Possible observations and mechanism of very long delayed radio echoes - Crawford - 1970 - Journal of Geophysical Research (1896-1977) - Wiley Online Library
Long delayed radio echoes – 80 years with an unexplained phenomenon
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Population registration of echo flow in the big brown bat's auditory midbrain | Journal of Neurophysiology
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LDE
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Long Delayed Echo: New Approach to the Problem
The Five Most Likely Explanations for Long Delayed Echoes - Department of Physics
Early First Reflected Sound
The Five Most Likely Explanations for Long Delayed Echoes - Department of Physics
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The Five Most Likely Explanations for Long Delayed Echoes - Department of Physics
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Experimental result of directional judgment of a long delayed reflection. | Download Scientific Diagram
Long Delayed Echoes : Echoed Radio signals which return to the sender several seconds after a radio transmission has occurred
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