The Surface Mining Control and Reclamation Act of 1977 (SMCRA) is the primary federal law that regulates the environmental effects of coal mining in the United States. SMCRA created two programs: one for regulating active coal mines and a second for reclaiming abandoned mine lands. (19 h 34 m, 2 abr 1977 año – 21 h 24 m, 12 jul 1977 año)
Añadido al timeline:
fecha:
19 h 34 m, 2 abr 1977 año
21 h 24 m, 12 jul 1977 año
~ 3 months and 11 days