Cymmer Colliery explosion
... that the Cymmer Colliery explosion of 1856 in Wales resulted in a "sacrifice of human life to an extent unparalleled in the history of coal mining of this country"?
... that the <b id="mwBes"><a href="./Cymmer_Colliery_explosion" id="mwBew" rel="mw:WikiLink" title="Cymmer Colliery explosion">Cymmer Colliery explosion</a></b> of 1856 in Wales resulted in a "sacrifice of human life to an extent unparalleled in the history of coal mining of this country"?