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Medium
- documentaries and factual works[remove]10
- sound recordings8
- black-and-white photographs6
- instructional materials6
- texts (document genres)5
- transcripts5
- photographs4
- timelines (chronologies)4
- articles3
- letters (correspondence)2
- study guides2
- web sites2
- maps1
- oral histories (literary works)1
- slide shows1
- slideshows1