Howard E. Boyer
Geoffrey Parrish
Wolfgang Lerche
Unknown Author
D. A. Prokoshkin
G. Parrish
Hossein Aghajani
Rogers & Hubbard Company, Middletown, Conn
American Society for Metals
Imperial Chemical Industries, ltd.
Krauss, George
Daniel E. Diesburg
International Federation for Heat Treatm
American Society for Metals. Committee on Gas Carburizing.
Konstantin Ledjeff