Jernberg, John. Forging: Manual of Practical Instruction in Hand Forging of Wrought Iron, Machine Steel, and Tool Steel; Drop Forging; and Heat Treatment of Steel, Including Annealing, Hardening, and Tempering. Chicago: American Technical society, 1919.

Jernberg, John. Forging: Manual of Practical Instruction in Hand Forging of Wrought Iron, Machine Steel, and Tool Steel; Drop Forging; and Heat Treatment of Steel, Including Annealing, Hardening, and Tempering. Chicago: American Technical society, 1919.