Riprap.jpg
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Riprap
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This image or file is a work of a
U.S. Army Corps of Engineers
soldier or employee, taken or made as part of that person's official duties. As a
work
of the
U.S. federal government
, the image is in the
public domain
.
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|
source:
http://www.orn.usace.army.mil/cof/Copy%20of%20Copy%20of%20MVC-021S.JPG
