Image: Upper Mississippi locks expansion study
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Description: Upper_Mississippi_locks_expansion_study
Title: Upper Mississippi locks expansion study
Credit: http://www.mvr.usace.army.mil/About/Offices/EmergencyManagement/Flood/LocksDams.aspx http://www.minnesotaikes.org/Facts/Locks.pdf
Author: Army corps of engineers and
Usage Terms: Public domain
License: Public domain
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