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Type in your search terms: try slave narratives AND kentucky, for example. Leave the pull-down menu on the right at Select a Field (keyword search).
Here's where you will need to use your critical thinking skills - as you examine the results ask yourself if the item is a primary source - in other words does it reflect firsthand knowledge of the event (as in autobiographies). If the event reflects second-hand knowledge of the event, and interpretation, then that is a secondary source and not primary.
Library Search by Author
If you are looking for a particular book by a certain author, such as an autobiography, the process is similar: