^"Marker #10-84 Captain Gordon C. Greene / Captain Mary Becker Greene". Remarkable Ohio. Archived from the original on 2011-07-19. Retrieved 2011-02-25. ... Mary Becker Greene (1867-1949) married Gordon C. Greene in 1890 and raised three sons - Captain Chris, Captain Tom, and Henry Wilkins. She learned navigation and earned a pilot and masters license, becoming one of the most noted figures on the Ohio and Mississippi rivers for more than a half century. The "Greene Line" fleet continued to expand with additions of the "Gordon C. Greene" and the "Delta Queen." Captain Mary Greene served as hostess on these steamboats. She died at the age of 81 on the renowned "Delta Queen," a National Historic Landmark.