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In page Baltimore Orioles:

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A long campaign of several decades was waged by numerous fans and sportswriters to return the name of the city to the "away" jerseys which was used since the 1950s and had been formerly dropped during the 1970s era of Edward Bennett Williams when the ownership was continuing to market the team also to fans in the nation's capital region after the moving of the former Washington Senators in 1971. After several decades, approximately 20% of the team's attendance came from the metro Washington area.[citation needed]