THE ECONOMICS OF THE COAL INDUSTRY
R. C. SMART
M.C., M.I.Min.E., Mining Engineer Member of the South Wales Institute of Engineers; Vice-President National Association of Colliery Managers. Author of "Recent Practice in the Use of Self-Contained Breathing Apparatus."
LONDON P. S. KING & SON, LTD. 14 GREAT SMITH STREET WESTMINSTER 1930