Walter S. Adams. "What Lies Between the Stars." Offprint, the Smithsonian Report for 1941, pages 141-149 (with 4 plates), publication 3652, Smithsonian Institution, Washington DC.  Very fine copy in original wrappers.  $45

• "Walter Sydney Adams (1876-1956, APS 1915), astronomer, explored the uses of spectroscopy, investigated sunspots and the rotation of the Sun, the velocities and distances of thousands of stars, and planetary atmospheres. Adams served as acting director and director of Mount Wilson Observatory from 1909 until 1946. Adams was the astronomer of stellar spectroscopy at Mount Wilson Observatory, 1904-1923, and Director, 1923-1946."--http://socialarchive.iath.virginia.edu/ark:/99166/w63n23sm