Ranma ½ (Ed. argentina) is a 10-book series with 10 released primary works first released in 1983 with contributions by Rumiko Takahashi.
The Argentine editions of Ranma 1/2 are broken into 50 volumes: the first 24 are the first 12 Japanese volumes split in half, and the rest are the same as the Japanese volumes. (Note that Japanese volumes 19-38 correspond to American volumes 17-36.)