PHOTOS: Nancy Finley wants recognition from Oakland Athletics for late mascot mule Charlie O. ahead of Turn Back The Clock Day - ABC7 San Francisco
Charlie-O — Baseball's Favorite Mule, by Michael Murphy, SMC Sports Journalism
A mule goes to a Kiwanis luncheon; vintage photos show what happened next
Remembering Charlie-O the mule, the A's mascot inspired by Charles O. Finley - The Athletic
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Charles O. Finley and His Kansas City A's Changed Baseball Forever – The Sport Digest
Bulletin Daily Paper 05/18/12 by Western Communications, Inc. - Issuu
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83 Charlie O The Mule Stock Photos, High-Res Pictures, and Images - Getty Images