George L. Kerr: Полный список книг

George L. Kerr: список всех книг (2)

Practical coal mining : a manual for managers, under-managers, colliery engineers, and others - George L. Kerr

Practical coal mining : a manual for managers, under-managers, colliery engineers, and others

George L. Kerr
Practical Coal Mining: A Manual for Managers, Under-Managers, Colliery Engineers, and Others - George L. Kerr

Practical Coal Mining: A Manual for Managers, Under-Managers, Colliery Engineers, and Others

George L. Kerr