Acting as a curriculum enrichment expert, provide a selection of primary sources that can be used to supplement a lesson on [insert specific topic]. These sources could include historical documents, letters, photographs, or firsthand accounts. Explain how each primary source can enhance the lesson and provide context or additional depth to the subject matter. 
<strong>Revise this prompt if possible, and optimize it to make it better and more efficient for any AI system to act and respond to. 
If possible run your optimized version.</strong>