Agria 42. (Az Egri Múzeum Évkönyve - Annales Musei Agriensis, 2006)

Szvircsek Ferenc: A Nógrád megyei üzemszerű szénbányászat összegző történeti áttekintése (1848–1992)

reached in coal production, the 33 mines still in operation extracting 3.8 million tonnes of coal. From 1973 only four mines were still in operation in the coalfield, and they were gradually phased out from 1987. Looking at the history of the coalfield, periods of great hope were frequently followed by trouble and crisis. With the ending of state coalmining in 1992, Nógrád County was to lose forever an industry rich in working class culture and tradition. 623