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Medium
- instructional materials17
- sound recordings9
- timelines (chronologies)8
- oral histories (literary works)7
- photographs7
- online exhibitions6
- black-and-white photographs4
- interviews4
- resource units3
- teaching guides3
- transcripts3
- annotated bibliographies2
- digital maps2
- documentaries and factual works2
- moving images2
- texts (document genres)2
- tours (journeys)2
- video recordings (physical artifacts)2
- web sites2
- articles1