The quiet sun

Gibson, Edward G.
Washington : National Aeronautics and Space Administration, Scientific and Technical Information Office; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1973.

The Search for extraterrestrial intelligence, SETI

[Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977.