United States. Office of Surface Mining Reclamation and Enforcement, author.
[Washington, D.C.] : Office of Surface Mining Reclamation and Enforcement, Department of the Interior
200-
United States. Office of Surface Mining Reclamation and Enforcement, author.
[Washington, D.C.] : Office of Surface Mining Reclamation and Enforcement, Department of the Interior
200-
United States. Office of Surface Mining Reclamation and Enforcement.
Washington, D.C. : U.S. Dept. of the Interior, Office of Surface Mining, 1990-
1989