THE DESIGN OF MINE STRUCTURES Ketchum (1912 First Edition, 1st Thousand) HC BOOK
IT IS THE FIRST 1912 EDITION, AND ONE OF THE FIRST 1,000 COPIES PRINTED. Featured are many mine structure designs and other specifications about their construction, cost, and other factors. Full table of contents are pictured so one could see the details of what is inside (including many foldout pages).