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Seasonally adjusted quarterly U.S. GNP from 1947(1) to 2002(3).
The format is: Time-Series [1:223] from 1947 to 2002: 1489 1497 1500 1524 1547 ...
http://www.stat.pitt.edu/stoffer/tsa4/ and http://www.stat.pitt.edu/stoffer/tsda/
gdp