Primary or Secondary Sources?

Steamboat Photographs

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Photograph of the General Lytle Steamboat.

Steamboats like this carried passengers, supplies, and mail across the United States. This is a primary source because it was photographed around 1877.

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Photograph of the Morning Star Steamboat.

This photograph is a primary source too because it was actually taken during its journey on the Ohio river.

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Photograph of the U.S Mail Packet Chesapeake Steamboat.

Is this photograph a primary or secondary source? Explain your answer.