PACER - data entry, retrieval, and update for the National Coal Resources Data System (phase I) /

Autor Cargill, Simon. M., Olson, A. C., Medlin, Antoinette L., Carter, M. Devereux
Vydáno 1976

Economic effects of western Federal land use restrictions on U.S. coal markets /

Autor Watson, William Downing, 1938-, Medlin, Antoinette L., Krohn, Kathleen K., Brookshire, David S., Bernknopf, Richard L.
Vydáno 1991