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Brian McQueenI think it had a lot to do with the team he played for.  The Washington Senators were for the most part, a pretty bad team during the years of 1909-1912 when many of these sets were released.  Their players, Johnson included, weren't featured in many of these sets.  Since so many "e" sets are between 30-50 cards, I think they wanted to take the more prominant players from the better teams in the league.