Description: British Coalfields, 19th Century
Credit: myself; coalfield specification is from this page of the article The Coal-Mining Industry of the United Kingdom by R. A. S. Redmayne, in a 1904 publication of The Engineering Magazine.
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes