00689cam a22002051 4500 gs 15000806 DLC 20260227111318.0 791128s1915 dcua f000 0 eng gs 15000806 (OCoLC)5736866 DLC ICharE DLC TN263 .W45 Wells, Roger Clark, 1877-1944. The Fractional precipitation of some ore-forming compounds at moderate temperatures / by Roger C. Wells. Washington, Govt. Print. Off., 1915. 46 p. : diagrs. ; 24 cm. U.S. Geological survey. Bulletin 609 United States. Geological Survey. Bulletin ; 609. 25589 25589