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This postcard features a photo of the Hoover Dam, which was the largest dam project in the world when it started in 1931. The project cost nearly $49 million and employed over 5000 people working in shifts around the clock. The postcard is produced by Mostly Postcard Inc. and includes their address in Scottsdale, Arizona. The photo on the postcard is courtesy of the Bureau of Reclamations and the date of the photo is January 2, 1935.