Starman Jones (1953) – Max Jones leaves his marginal farm in the Ozarks and sets out to make a new life as a spaceman. He meets and teams up with a rogue who manages to sneak them into space as deckhands, and both make the best of their opportunities. Max’s trick memory saves the ship when a rival sabotages the navigation books, and he brings the ship safely back to earth as its captain.
For more information on Heinlien's Juveniles (written between 1947 and 1958) see our entry on Robert Heinlein's Rocket Ship Galileo, The Literary Encyclopedia profile by William Patterson, University of California, Santa Cruz
Patterson, William. "Starman Jones". The Literary Encyclopedia. First published 10 November 2004
[https://www.litencyc.com/php/sworks.php?rec=true&UID=16612, accessed 23 April 2018.]