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MLB on Twitter: "MLB clubs will wear jersey patches throughout 2019 in celebration of the 150th anniversary of the first openly all-salaried professional baseball team (1869 @Reds). #MLB150 https://t.co/F6VTrMU0vY" / Twitter
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MLB Unveils 2019 Holiday & Special Event Uniform Elements | by Chicago White Sox | Inside the White Sox
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MLB releases 2019 caps and uniforms for holidays, All-Star Game and other special events - CBSSports.com
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