"South Yorkshire Coalfield" . "coal mining" . "Nottinghamshire, Derbyshire and Yorkshire Coalfield" . "region's" . "South Yorkshire" . "Yorkshire Coalfield" . . . "Nottinghamshire, Derbyshire and Yorkshire Coalfields" . "Yorkshire coalfield" . "Yorkshire" . "South Yorkshire Coalfield" . "South Yorkshire coalfield" . . "coalfields of South Yorkshire" . "coal mining area" . .