Illustrated History Of Football Reed International Books Limited 1996 | Scottish Journal of Political Economy |
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In Eric Dunning, Joseph A | Austin, Merrill 10 July 2007 |
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The number of competing teams has varied over the history of the competition | "Scottish Journal of Political Economy" |
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It has been estimated that there were 22 million soccer players in the world in the early 1980s, and that number is increasing | "Law 3 — The Number of Players" |
The most recent changed was in , from 24 to 32 | Dart, James; Bandini, Paolo 21 February 2007 |
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Embassy of the United States in London | Under the system used in Argentina and most of Latin America, two season titles are awarded each year — the Apertura and Clausura |