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#DidYouKnow it took more than 5,000,000 barrels of cement to build the #HooverDam? #DamFacts #TDiH #onthisday pic.twitter.com/EyCyJxxmvn
— Reclamation (@usbr) July 7, 2015
#OnThisDay in 1931, construction began on #HooverDam! Here are some more #damfacts http://t.co/8b2U3sx5AM #TDiH pic.twitter.com/G9vFKQlCGK
— Reclamation (@usbr) July 7, 2015
Thanks to John Fleck for the link to the press release above.