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This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark

Discover the cutting-edge developments and technical innovations that defined engineering in the Black Hills at the turn of the century. The Black Hills Enginee

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced