Coal mines and mining — Audiobooks

Coal and the coal mines

Coal and the coal mines

by Homer Greene

The Mentor: The Story of Coal, vol. 6, Num. 6, Serial No. 154, May 1, 1918

The Mentor: The Story of Coal, vol. 6, Num. 6, Serial No. 154, May 1, 1918

by Charles Fitzhugh Talman