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jamiethe Hazleton Red Sox were a short-lived franchise (1937-1938) that played in Cranberry Park in Hazleton, Pennsylvania and were part of the Eastern League- that's single A. heres a link to the line-up http://www.theelsa.com/catobase/teams/haz/1938.html
postcards can easily be dated by looking at the backs. post a scan and ill help you out