A researcher doing a historical study in 2007 relies on sources published between 1910 and 1950 to investigate home schooling as practiced by pioneers who went West between 1800 and 1860. This study illustrates the error of

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The study illustrates the error of excessive use of secondary sources because the researcher is relying on sources published long after the period being studied (1910-1950 to investigate 1800-1860), rather than primary sources from the time of the pioneers.

A Researcher Doing a Historical Study in 2007 Relies on Sources