Corps of Engineers to host Lock and Dam 4 open house,
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, , Press Operations, {authorlink}, https://www.mvp.usace.army.mil/Media/News-Releases/Article/2694333/corps-of-engineers-to-host-lock-and-dam-4-open-house/, https://www.mvp.usace.army.mil/DesktopModules/ArticleCS/RSS.ashx?ContentType=9&Site=465&isdashboardselected=0&max=20, St. Paul District News Releases,
, , U.S. Army Corps of Engineers – St. Paul, 1919, July 14, 2021, 1:44 pm