Double Star is UB Only.
Novel original copyright 1956
A daring impostor fools two worlds in tomorrow's galactic empire
Use for educational purposes only. Single copies (print, photocopy, download) are permitted for personal study, research, and teaching.
Powers, Richard M. and Heinlein, Robert A. (Robert Anson), 1907-1988, “Double Star,” Digital Collections - University at Buffalo Libraries, accessed January 21, 2021, https://digital.lib.buffalo.edu/items/show/28976.