Dept. of Energy, Assistant Secretary for Conservation and Solar Applications, Transportation Programs Office : for sale by the Supt. of Docs., U.S. Govt. Print. Off.1978.<DK41-6>
Dept. of Energy, Assistant Secretary for Conservation and Solar Applications, Transportation Programs Office : for sale by the Supt. of Docs., U.S. Govt. Print. Off.1979.<DK35-96>