A path where no man thought : nuclear winter and the end of the arms race / Carl Sagan, Richard Turco. Sagan, Carl, 1934-1996. Turco, Richard P., 1943- Nuclear winter. QH545.N83 S24 1990 304.28 20 SAG Includes bibliographical references (p. 303-418) and index. New York : Random House, c1990. c1990. 1990 Text xxii, 499 p., [18] p. of plates : eng