THE MENTOR 1918.05.01, No. 154,
The Story of Coal
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