Historial Statistics of the United States - Online

Susan Carter, Scott Gartner, Michael Haines, Alan Olmstead, Richard Sutch, and Gavin Wright (Editors)

To provide a definitive source for American statistical information, containing over 37,000 times series and 70 original essays on
the history and sources of data.

Any conceivable variable.

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J. P. Murmann on 2009-01-25: This is an excellent source.

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