Items
recipient is exactly
U.S. Bureau of Mines
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[MF22AZ], Letter from Thomas Alva Edison to George A Richter, U.S. Bureau of Mines, December 11th, 1917 1917-12-11 -
[MF31BE], Telegram from William Henry Meadowcroft to U.S. Bureau of Mines, H H Beebe, January 16th, 1918 1918-01-16