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Medium
- instructional materials14
- timelines (chronologies)14
- photographs11
- sound recordings7
- online exhibitions5
- oral histories (literary works)4
- teaching guides4
- articles3
- black-and-white photographs3
- interviews3
- texts (document genres)3
- annotated bibliographies2
- digital maps2
- learning modules2
- legislative records2
- lesson plans2
- letters (correspondence)2
- maps2
- moving images2
- reports2