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Medium
- documentaries and factual works[remove]28
- instructional materials17
- sound recordings16
- texts (document genres)15
- black-and-white photographs10
- study guides10
- timelines (chronologies)10
- web sites10
- transcripts9
- photographs7
- articles5
- letters (correspondence)4
- bibliographies3
- interviews2
- maps2
- news2
- oral histories (literary works)2
- slide shows2
- biographies1
- slideshows1