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Dan BrettaDavid, I have found with college photos from this time period that the date on the ball or jerseys is usually the year of expected graduation. I collect yearbooks and almost always the football players are divided by class for the team photo. It can be very confusing to date college photos.
Check this link for Christy Matthewson at Bucknell College- it has him listed as class of 1902, but he dropped out after 1899 to pursue his professional baseball career.
http://www.bucknell.edu/x2869.xml