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Medium
- instructional materials[remove]9
- documentaries and factual works6
- timelines (chronologies)5
- photographs4
- sound recordings4
- black-and-white photographs3
- study guides3
- articles2
- maps2
- texts (document genres)2
- transcripts2
- web sites2
- annotated bibliographies1
- lesson plans1
- letters (correspondence)1
- oral histories (literary works)1
- slide shows1
- slideshows1
- teaching guides1