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Hamlin, Augustus C. (Augustus Choate), 1829-1905. The tourmaline : its relation as a gem; its complex nature; its wonderful physical properties, etc., etc.; : with special reference to the beautiful and matchless crystals found in the state of Maine. / By A.C. Hamlin, M.D., Member de la Societe Royale des Antiquarires du Nord," member of the Acadermy of Sciences, Philadelphia, &c., &c. ; with illustrations."