Robert H Smith wrote the treatise on machining which was used to teach the tens of thousands of machinists which allowed the US to win two world wars. Written to take a farm boy who'd never held a file, to that of Master Machinist.
Textbook_of_Advanced_Machine_Work-Robert_H_Smith-1910.pdf
Textbook_of_the_Elements_of_Machine_Work-Robert_H_Smith-1910.pdf
Textbook_of_the_Principals_of_Machine_Work-Robert_H_Smith-1910.pdf