(USDOE ASSISTANT SECRETARY FOR CONSERVATION AND RENEWABLE ENERGY, WASHINGTON, DC (UNITED STATES). ADVANCED PROPULSION DIV.)United States. Dept. of Energy(United States. Dept. of Energy)1993.
(USDOE ASSISTANT SECRETARY FOR CONSERVATION AND RENEWABLE ENERGY, WASHINGTON, DC (UNITED STATES))United States. Dept. of Energy(United States. Dept. of Energy)1992.
(USDOE ASSISTANT SECRETARY FOR CONSERVATION AND RENEWABLE ENERGY, WASHINGTON, DC (USA). ADVANCED PROPULSION DIV.)United States. Dept. of Energy(United States. Dept. of Energy)1990.