Usage examples for coal:

• The first thing I saw this morning was the account of the shooting at the coal yards. "In His Steps" – Charles M. Sheldon

• We won't try to get out coal to- day, an', perhaps, by night Mr. Wright will have a better plan. "Down the Slope" – James Otis

• They want coal and oil. "Youth" – Isaac Asimov

• We spent a lot of hours gazing out to sea, I didn't find that boring, there was always something fresh to see, even when looking at nothing in particular there was the ever- changing pattern of the waves, not unlike the changing patterns in a glowing coal fire. "Coming of Age: 1939-1946" – John Cox