This June 15, 2017, photo provided by Kenneth Madsen, shows a post-on-rail style of fence along the flood plain of the Colorado River between Arizona and Baja California, which is typical of border wall fences placed in environmentally sensitive areas or in areas prone to flooding. A new photo exhibit by Madsen opening Wednesday, Sept. 19, 2018, at the Ohio State University-Newark campus, "Up Close with U.S.-Mexico Border Barriers,” highlights different types of border wall fencing. (Kenneth Madsen via AP)
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