Henry Norris Russell. “Dark Nebulae”, Offprint, Proceedings of the National Academy of Sciences, vol 8, pp 115-118, May 1922, Communications to the National Academy of Sciences, No 77, Carnegie Institution of Washington, Mount Wilson Observatory, 4pp. Original wrappers. Very fine copy.
_____. “The Intensities of Lines in Multiplets, I, Theory; The Intensities of Lines in Multiplets, II, Observed Data. Offprint, Proceedings of the National Academy of Sciences, vol 11, pp 314-328, June 1925. Communications to the National Academy of Sciences, No 93, Carnegie Institution of Washington, Mount Wilson Observatory, 4pp. Original wrappers. Fine copy.
_____. “The Constitution and Evolution of the Stars”, offprint from the Smithsonian Report for 1923, pages 145-158, publication 2759, Washington DC, Government Printing Office, 1925. Original wrappers, removed from a larger bound volume.
3 items: $125