This is a reproduction of a book published before 1923. This book may have occasional imperfectionssuch as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed worksworldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.++++The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ Mining And Metallurgy: Published Monthly By The American Institute Of Mining And Metallurgical Engineers, Issue 153 American Institute of Mining and Metallurgical Engineers, American Institute of Mining, Metallurgical, and Petroleum Engineers The Institute, 1919 Technology & Engineering; Metallurgy; Mineral industries; Technology & Engineering / Metallurgy; Technology & Engineering / Mining