7Umut Halik, Friedrich - IC Bandelow, Joerg Schulz. Socio - economic aspects of the local mining sector and altematlve sources of income of the Helan Shan region in Ningxia and Inner Mongolia, China [ C]//in Proceedings of the International Conference on Coal Fire Research, Beijing, 29 Nov. - 01 Dec. 2005. UNESCO Beijing, 200-202.