Final answer:
Primary sources are firsthand accounts of historic events, while an historian's interpretation is not considered a primary source.
Step-by-step explanation:
A primary source is a firsthand account of a historic event. It is a document or object that was created or written during the time period being studied. An historian's interpretation of an event, while valuable, is not considered a primary source because it is a secondary source that is based on the analysis and research of primary sources. Primary sources include documents like photographs of the event, interviews with witnesses, and letters from people who experienced the event.
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