Hearing Before the Committee on Mines and Mining, United States Senate, Sixty-third Congress, Second Session, on S. 4405, a Bill to Provide for and Encourage the Prospecting, Mining, and Treatment of Radium-bearing Ores in Lands Belonging to the United States, for the Purpose of Securing an Adequate Supply of Radium for Government and Other Hospitals in the United States. February 10-24, 1914