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Medium
- documentaries and factual works[remove]15
- instructional materials9
- sound recordings9
- texts (document genres)8
- black-and-white photographs6
- timelines (chronologies)6
- study guides5
- transcripts5
- photographs4
- web sites4
- articles3
- letters (correspondence)2
- maps2
- news2
- biographies1
- interviews1
- oral histories (literary works)1
- slide shows1
- slideshows1
- unedited footage1