Chemical contributions to the geology of Canada coals and lignites of the North-West Territory This book, "Chemical contributions to the geology of Canada coals and lignites of the North-West Territory", by G. Christian Hoffmann, is a replication of a book originally published before 1884. 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.