Context

Context of Phosphate resources of the United States : hearings before the Joint committee to investigate the adequacy and use of phosphate resources of the United States, Congress of the United States, Seventy-fifth Congress, third session, pursuant to Public resolution no. 112, a joint resolution to create a joint congressional committee to investigate the adequacy and use of the phosphate resources of the United States. June 18, 20, and 21, July 20, 21, and 22, November 21, 22, 24, 25, 28, and 29, 1938
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