THE MENTOR 1918.05.01, No. 154, The Story of Coal
Reading edition
LEARN ONE THING EVERY DAY
MAY 1 1918
SERIAL NO. 154
THE MENTOR THE STORY OF COAL
By CHARLES FITZHUGH TALMAN
Editorial Writer for the Scientific American
DEPARTMENT OF SCIENCE
VOLUME 6 NUMBER 6
TWENTY CENTS A COPY