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current | 23:55, 16 February 2007 | 1,024 × 826 (734 KB) | Dual Freq | {{Information |Description=Upper Mississippi River Stairway of Water, the lock and dam network. |Source=http://www.mvp.usace.army.mil/docs/StairwayofWater.pdf |Date=Unknown |Author=US Army Corps of Engineers |Permission={{PD-USACE}} |other_versions= }} [ |
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