1991 · M Madden, USDOE, Washington, DC (United States), et al. · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 4
1998 · M Madden, USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States) · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)