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Changes in 1970 Made Wrigley Field 'Friendly Confines,' Says Author of New Book -- Central Park Communications
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Central Park Communications - Historical commentary, books, and consulting
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What is the difference between a baseball ballpark and stadium? - Quora
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Chicago Cubs Baseball: 1960s, 1970s & 1980s - HubPages
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11 Things You Didn't Know About Wrigley Field - Parade
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Football in baseball stadiums