![President [Hoover] congratulates winnters of safety contest. Representatives of four winning companies in the National Safety Competition in Mining and Quarrying, conducted by the United States Bureau of Mines, were awarded the "Sentinels of Safety" and congratulated by President Hoover at the White](https://thumbs.arkivism.com/loc-2016879294.jpg)
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President [Hoover] congratulates winnters of safety contest. Representatives of four winning companies in the National Safety Competition in Mining and Quarrying, conducted by the United States Bureau of Mines, were awarded the "Sentinels of Safety" and congratulated by President Hoover at the White
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit linePresident [Hoover] congratulates winnters of safety contest. Representatives of four winning companies in the National Safety Competition in Mining and Quarrying, conducted by the United States Bureau. 1931. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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