Supporting the Permanency of the 15% Depletion Rate for Fluorspar Mines1945-10-16unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_047_1_5_23_0010The document is a series of letters between William S. Hill, George Schwabe, and Edgar J. Marston regarding House Bill H.R. 3693, which is essential for the future mining of Fluorspar. They discuss the need for a permanent 15% depletion rate for Fluorspar mines and express willingness to cooperate and offer support in securing this rate.