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Medium
- instructional materials22
- photographs14
- timelines (chronologies)9
- online exhibitions8
- oral histories (literary works)7
- black-and-white photographs5
- sound recordings5
- teaching guides5
- legislative acts3
- lesson plans3
- texts (document genres)3
- writings3
- annotated bibliographies2
- articles2
- biographies (literary works)2
- correspondence2
- digital maps2
- moving images2
- newspaper clippings2
- posters2