Making a case to retire No. 21 league wide
What Number Should Be Retired League-Wide Next? - Stadium
Which pro sports teams have the most retired numbers?
ARI/COL/SEA/TB/TOR/WSN Retired Numbers (Picture Click) Quiz - By Peacemaker
Rangers set to make Pudge's No. 7 their third retired number; who should be next, plus a historical look
Clemente's #21 will not be retired across MLB despite report
The best players to wear every jersey number in Pirates history - The Athletic
That's Andrew McCutchen's number': The Pirate who protected No. 22 until his return
Demilio: Roberto Clemente Day Serves as Another Reminder to Retire No. 21
Every MLB team's retired numbers – NBC Sports Chicago
MLB Retired Numbers Pittsburgh Pirates by stevejrogers
Bryan Reynolds helps Pirates hold on against Nationals
Home run king Barry Bonds has No. 25 retired by Giants