20 Hrs. 40 Min.: Our Flight in the Friendship is a book written by pioneering aviator Amelia Earhart. It was first published in 1928 by G. P. Putnam's Sons, but has continued to be reprinted in periodic new editions. A special "Author's Autograph Edition" of 150 signed and numbered copies was also produced in 1928. Each copy of this special edition contained a miniature silk American flag carried by Earhart in her flight on the Friendship from Boston to Wales. National Geographic republished the work in 2003 under its National Geographic Adventure Classics imprint.