The North East's coal mining past is an important part of our heritage, but how much do you know about its effect on the area where you live?
At the industry's peak, there were 400 pits, employing a quarter of a million people.
The records of the Durham Miners' Association from that time are held at Sunderland University.
Now for the first time, the whole collection is available on the internet. It is attracting interest from scholars all over the world. Lucy Taylor has been to see it.
More top news
Middlesbrough's survival hopes were seriously dented after slipping to a 1 nil defeat at the hands of relegation rivals Crystal Palace.
The 2-0 defeat - their sixth in 11 league matches - for bottom side Sunderland saw them slip four points from safety .
Ciaran Clark's 82nd-minute header earned a huge point in the race for promotion after the Robins had gone in at half-time with a shock lead