11. Potash. To amend act authorizing investigations by Secretary of Interior and Secretary of Commerce jointly to determine location, extent, and mode of occurrence of potash deposits in United States and to conduct laboratory tests, hearings, 69th Congress, 2d session, on H. R. 15827, Feb. 1927. Bookmark Corporate/Agency Authors: Mines and Mining Committee, House and Congress Publisher: Mines and Mining Committee, House Date: 1927 SuDoc number: Y 4.M 66/1:P 84/3