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- articles6
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- photographs[remove]6
- sound recordings6
- timelines (chronologies)5
- letters (correspondence)4
- black-and-white photographs3
- documentaries and factual works3
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- maps2
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- annotated bibliographies1
- correspondence1
- interviews1
- learning modules1
- maps (documents)1
- newsletters1
- oral histories (literary works)1
- records1