Sams Tube Substitution Handbook Lot of 3 by the Howard W. Sams Engineering Staff 

Includes: 
  • Tube Substitution Handbook 13th Edition 1970. 
  • The Substitution Handbook 13th Edition First Printing 1970. 
  • Tube Substitution Handbook 8th Edition First Printing 1964. 
Review images for signs of damage that includ creasing and yellowing of pages.