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Historically , rowing races on the River Clyde here attracted huge crowds of spectators to watch regattas in the late 19th century and early 20th century ; before football caught the public imagination .
 River Clyde
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 River Clyde