Dragon Ball. Vol. 9 / story and art by Akira Toriyama ; [English adaptation by Gerard Jones ; translation, Mari Morimoto ; touch-up art & lettering, Wayne Truman ; graphics & design, Sean Lee].
"In the original Japanese edition, Dragon Ball and Dragon Ball Z are known collectively as the 42-volume series Dragon Ball. The English Dragon Ball Z was originally volumes 17-42 of the Japanese Dragon Ball"--P. facing title page.
Summary
After defeating the Red Ribbon Army and taking their Dragon Balls, Goku finds that one is still missing. To find it, he goes to the palace of the All-Seeing Crone, Baba Urani, who agrees to find the ball for free if Goku and his friends can best her five supernatural champions in one-on-one combat.