Tau Zero is UB Only.
1971 Nominee Hugo Award
Use for educational purposes only. Single copies (print, photocopy, download) are permitted for personal study, research, and teaching.
not identified and Anderson, Poul, 1926-2001, “Tau Zero,” Digital Collections - University at Buffalo Libraries, accessed October 20, 2020, https://digital.lib.buffalo.edu/items/show/29294.