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Medium
- documentaries and factual works[remove]6
- sound recordings6
- black-and-white photographs4
- instructional materials4
- photographs3
- transcripts3
- articles2
- texts (document genres)2
- timelines (chronologies)2
- biographies1
- interviews1
- letters (correspondence)1
- oral histories (literary works)1
- slide shows1
- slideshows1
- study guides1
- web sites1