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. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . /yYZ. PERMANENT TIMBERING OF HEADING. \ \ \ \ / j- _ ] \ , t r PncENixviLLE Tunnel. P. S. V. {To face page 200.) PLATE XIL.
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Keywords: ., book, bookcentury1900, bookdecade1900, bookpublishernewyorkjwiley