I'm starting to realize that Brooklyn players from the T206 set are filled with a bunch of non-notable and unremarkable players. William Ridldle "Doc" Marshall was one of them. Doc was a journeyman outfielder and catcher. During a 6 year period he played for 6 different clubs, often bouncing around mid-season between team to team. In his first year in 1904 he played for 3 different organization, but on 4 different occasions- starting with Philadelphia, then the Giants, on to the Boston Beaneaters and then back to the Giants.
In his last year in the pros he finally landed in Brooklyn in 1909, and batted a less than robust .201 in 50 games. At least he stuck around for the entire year. Thereafter, Doc played 4 more years of professional ball, primarily with the Milwaukee Brewers of the American Association.