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Medium
- instructional materials7
- photographs[remove]7
- articles5
- sound recordings5
- letters (correspondence)4
- timelines (chronologies)4
- black-and-white photographs3
- documentaries and factual works3
- teaching guides3
- legislative records2
- lesson plans2
- maps2
- maps (documents)2
- texts (document genres)2
- transcripts2
- slideshows1
- web sites1