File:Cal Ripken Sr. & Jr..JPG - Wikipedia
Billy, Cal Sr. and Cal Ripken Jr. - 1987 : r/baseball
Cal Ripken Jr. Academy of Achievement
Cal Ripken Sr. Foundation set to open Youth Development Park in Prince George's Co. - WTOP News
Baltimore Orioles - Wikipedia
Cal Ripken Jr. Academy of Achievement
Cal Ripken Sr. – Society for American Baseball Research
Just Show Up: And Other Enduring Values from Baseball's Iron Man: 9780062906748: Ripken Jr., Cal, Dale, James: Books
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Ripken, Cal Baseball Hall of Fame
Billy, Cal Sr. and Cal Ripken Jr. - 1987 : r/baseball