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Medium
- instructional materials26
- teaching guides19
- resource units16
- transcripts12
- interviews11
- oral histories (literary works)11
- fliers (printed matter)5
- photographs4
- timelines (chronologies)4
- articles3
- lesson plans3
- sound recordings3
- video recordings (physical artifacts)3
- annotated bibliographies2
- black-and-white photographs2
- legislative records2
- letters (correspondence)2
- maps (documents)2
- newspapers2
- web sites2