The coal mines containing a description of the various systems of working and ventilating mines, together with a sketch of the principal coal regions of the globe, including statistics of the coal production This book, "The coal mines", by Andrew Roy, is a replication of a book originally published before 1876. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.