Wheel Tractor-scrapers Conducting Levee Work
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视频说明
One minute video of wheel tractor-scrapers conducting levee work April 30, 2012, along South River Road in West Sacramento, Calif. The U.S. Army Corps of Engineers Sacramento District is working to complete a setback levee and install a seepage cutoff wall in the levee’s center, further reducing the city’s flood risk.
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24 五月 2016
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