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Medium
- instructional materials46
- teaching guides21
- black-and-white photographs14
- sound recordings14
- timelines (chronologies)14
- photographs12
- lesson plans11
- articles9
- documentaries and factual works7
- resource units7
- texts (document genres)7
- web sites7
- oral histories (literary works)6
- interviews5
- maps5
- transcripts5
- correspondence4
- letters (correspondence)4
- slide shows4
- speeches4