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Medium
- documentaries and factual works[remove]17
- instructional materials17
- study guides10
- texts (document genres)10
- timelines (chronologies)10
- web sites9
- sound recordings8
- black-and-white photographs5
- photographs5
- transcripts4
- articles3
- bibliographies2
- letters (correspondence)2
- maps2
- oral histories (literary works)2
- slide shows2
- biographies1
- interviews1
- slideshows1