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Should We Believe in the Pittsburgh Pirates?
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Pirates' alternate uniform harkens to early '70s
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Baltimore Orioles: Uniform Analysis of the 1966-1970 O's
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You're wearing that? Ugliest MLB uniforms in history
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Pirates' alternate uniform harkens to early '70s
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MLB uniforms, ranked: Ranking all 30 teams' uniforms ahead of the 2020 season
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The History of the Atlanta Braves Uniforms (1966-Present)
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Chicago White Sox, Baseball Wiki
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Pirates announce roster, schedule for alternate training site
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How the Pittsburgh Pirates sparked a uniform revolution in the 1970s - ESPN