1. Commodity markets and models: the range of experience;Labys,1978
2. The Efficiency of the Coal Industry;Henderson,1958
3. Activity Analysis of Production and Location;Koopmans,1951
4. Interregional structure of the US coal economy;Libbin;American Journal of Agricultural Economics,1977
5. Environmental Regulation and the Allocation of Coal: A Regional Analysis;Schlottmann,1975