Scientific American. MARCH 13, 1880.] … Blowpipe Analysis, and other additions. By Henri HENRY R, WORTHINGTON, Erni, M.D. 12mo, . . ‘ ; $2 50 VALLEY MACHINE CO Lieber.—Assayer’s Guide; Or, Practical Directions to 239 Broadway,N.Y. S83 Water St., Boston. Assayers, Miners, and Smelters, for the Tests and THE WORTHINGTON PUMPING ENGINES FOR…
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