Section of colliery plan, Hartley Colliery<br> Illustration for the Illustrated Times, 1 February 1862. No 357. Vol. 14.<br><a rel="nofollow" class="external text" href="https://books.google.co.uk/books?id=xz1NAAAAcAAJ&amp;pg=PA34&amp;lpg">See Illustrated Times</a>
<bdi><a href="//commons.wikimedia.org/wiki/Category:19th-century_unidentified_engravers" title="Category:19th-century unidentified engravers">Unidentified engraver</a>
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1 February 1862<div style="display: none;">date QS:P571,+1862-02-01T00:00:00Z/11</div>
Illustrated Times