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The National Museum of Puerto Rican Arts & Culture - On September 9th we join the Pittsburgh Pirates in wearing #21 to honor the legacy of Roberto Clemente and for the MLB
Ríos, Hernández to wear uniform No. 21 on Roberto Clemente Day, by Rowan Kavner
Pirates to wear Roberto Clemente's number on Sept. 9 - Uniform Authority
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Pirates to wear No. 21 on jerseys for Roberto Clemente Day
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Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente - The San Diego Union-Tribune
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