"KING OF THE COWBOYS"-about a dozen Western movie stars have borne that title since 1903. But, in my opinion, only three really stand out: William S. Hart, Tom Mix and Buck Jones. Of this trio only Buck Jones was an authentic cowboy. Perhaps his name may not mean much to this generation, yet there was a time when practically every boy in the United- States would rather have been Buck Jones than President. Unlike Tom Mix, off screen Buck was a quiet, studious person. He rarely wore cowboy clothes in public because he felt it looked as if he were...