Google groups the data into intervals whose length in seconds is defined by this parameter. ![]() The exchange must be in upper case and can be left blank for American exchanges. For example, NASDAQ for GOOG or CURRENCY for EURUSD. The exchange where the security is listed. This parameter is case sensitive and must be capitalized to be recognized. For example, GOOG for Google or EURUSD for the Euro/Dollar currency pair. The idea consists of parameterizing a URL of the form. The article Visualizing Live and Historic Stock Data Using Silverlight analyzes in depth how this can be automated to retrieve historical data automatically. It offers pretty interesting data and includes the option, for some stocks, to download historical prices through a "Download to spreadsheet" link located precisely at the stock's "Historical prices" page. Google started a finance service in 2006 that is currently accessible at.
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